Best Multimeter Clamp Reviews for Accurate Measurements

If you’re anything like me, you’ve probably faced the frustration of an electrical problem – a flickering light, a mysterious power drain, or trying to diagnose a stubborn car battery issue. That’s where a reliable multimeter clamp comes into play. I’ve spent countless hours in workshops and on DIY projects, and I can tell you firsthand that having the right tool for accurate measurements makes all the difference for both safety and success. It’s not just about getting a reading; it’s about getting a precise reading without having to break the circuit, which is exactly what these clever clamp meters do. In this guide, I’ve dug deep into some of the best multimeter clamp reviews to help you find the perfect one for your needs, ensuring you get accurate measurements every time you troubleshoot electrical issues. Let’s dive in and find the clamp meter that will become your new best friend for all things electrical!

IMAGE	PRODUCT NAME	AMAZON LINK
	AstroAI Digital Clamp Meter Multimeter 2000 Counts Amp…	View on Amazon
	FNIRSI DMC-100 Digital Clamp Meter Multimeter 9999 Counts…	View on Amazon
	Fluke 325 Clamp Multimeter AC-DC TRMS	View on Amazon
	KAIWEETS Smart Digital Clamp Meter with D-Shaped Jaws,…	View on Amazon
	DigitPro Digital Clamp Meter Multimeter with D-Shaped Jaw,…	View on Amazon
	KAIWEETS Digital Clamp Meter Multimeter with D-Shaped Jaw…	View on Amazon
	Fluke 117/323 Kit Multimeter and Clamp Meter Combo Kit…	View on Amazon
	ZIBOO 69140 K-Type Thermometer, Pipe Temperature Clamp for…	View on Amazon
	MESTEK Digital Clamp Meter Multimeter TRMS 6000 Counts…	View on Amazon
	ZKH Inrush Digital Clamp Meter Multimeter, 1000A Amp Clamp…	View on Amazon

AstroAI Digital Clamp Meter Multimeter 2000 Counts Amp…

The AstroAI Digital Clamp Meter is a fantastic entry-level option for anyone needing reliable AC current measurements without breaking the bank. I’ve found it incredibly useful for basic household tasks where I need to check appliance current draw or troubleshoot wiring. Its large jaw opening means I can easily clamp around conductors without disconnecting them, which is a huge time-saver. Plus, the thoughtful design with backlit LCD and flashlight makes working in dimly lit areas much less of a headache. This meter really shines with its non-contact voltage testing (NCV), giving you an audible and visual alarm, which is a great safety feature, especially for beginners. It’s a solid, straightforward tool that covers the essentials.

Key features that stand out:
– Versatile Digital Clamp Meter: Measures AC Current, AC/DC Voltage, Capacitance, Resistance, Diode Continuity, and Live Wire Tests.
– Large Jaw Opening: Allows measuring AC current in conductors up to 2000 counts without contact.
– Thoughtful Design: Includes Data Hold, Max/Min, Auto Shut-off, low battery indicator, continuity buzzer, LCD Backlit Screen, and Flashlight.
– Non-contact Voltage Testing (NCV): Provides sound and light alarms for AC signal detection.

Pros:
– Excellent value for its price point.
– Easy to use with a clear, backlit display.
– NCV function adds a layer of safety for quick checks.
– Compact design is great for narrow spaces.
Cons:
– It does not measure DC current, which limits its versatility for some automotive or solar applications.

Best for: DIY enthusiasts, homeowners, and beginners needing an affordable and reliable AC current measurement tool for household electrical issues.

Expert Opinion: This meter is a solid choice for general home electrical work and basic AC diagnostics. Its focus on user-friendliness and essential features makes it a great starting point, though pros might miss DC current capabilities.

FNIRSI DMC-100 Digital Clamp Meter Multimeter 9999 Counts…

The FNIRSI DMC-100 immediately caught my eye with its vibrant full-color display – it’s a real step up in terms of user experience! This 9999-count True RMS clamp meter is surprisingly feature-rich for its size, handling AC/DC voltage and current, along with capacitance, resistance, and temperature. What I really appreciate is the data analysis and storage capability, allowing me to track trends and view historical records, which is incredibly helpful when diagnosing intermittent issues. The rechargeable 1500 mAh lithium battery with Type-C charging is another huge plus, meaning no more scrambling for AAA batteries in the middle of a job. Its intelligent design makes complex measurements accessible.

Key features that stand out:
– 9999 TRMS Clamp Meter: High-resolution measurement for AC/DC voltage, AC/DC current (max 600A), capacitance, resistance, frequency, and temperature.
– Data Analysis/Storage: Features data curve tracking, max/min values, and built-in storage for real-time and historical records.
– HD Full-Color Display & Dual Themes: 2″ 240×320 TFT screen with dark/light UI, 10-level brightness, and flashlight function.
– Portable & Rechargeable: Built-in 1500 mAh lithium battery with Type-C fast charging for long-lasting use.

Pros:
– High accuracy with 9999 counts and True RMS.
– Full-color display and data logging are excellent for detailed analysis.
– Rechargeable battery is convenient and eco-friendly.
– Measures both AC and DC current, offering greater versatility.
Cons:
– The smaller screen size, while high-res, might be less ideal for some users compared to traditional large LCDs.

Best for: Tech-savvy DIYers, hobbyists, and professionals who value detailed data analysis, a modern interface, and portability in a clamp meter.

Expert Opinion: The FNIRSI DMC-100 offers an impressive array of advanced features for its price point, especially the full-color display and data analysis. It’s a strong contender for those needing more than just basic readings.

Fluke 325 Clamp Multimeter AC-DC TRMS

When it comes to reliability and ruggedness, Fluke is a name that often comes up in conversations with experienced electricians, and the Fluke 325 is no exception. This True RMS meter is a workhorse, designed to provide accurate readings on both linear and non-linear loads, which is crucial in today’s world of complex electronics. I’ve always found Fluke meters incredibly intuitive, and the 325’s audible continuity sensor is a simple but effective feature that saves time. Its safety ratings (CAT IV 300V, CAT III 600V) give me immense confidence when working in demanding environments. It’s built to last and performs consistently, making it a professional’s staple.

Key features that stand out:
– True RMS Sensing: Provides accurate readings for AC voltage and current on non-linear loads.
– Comprehensive Measurements: Measures AC current to 400A, AC/DC voltage to 600V, resistance to 4 kilohms, capacitance, and temperature.
– Robust Safety Ratings: Meets IEC safety standard 61010-1, rated for CAT IV 300V and CAT III 600V installations.
– Jaw Opening: Measures current in a conductor up to 30 millimeters without contact.

Pros:
– Unmatched reliability and durability from a trusted brand.
– True RMS ensures accuracy in diverse electrical environments.
– High safety ratings for professional use.
– Measures both AC and DC current.
Cons:
– It is a more premium-priced option compared to some others on this list, which might be a barrier for budget-conscious users.

Best for: Professional electricians, industrial maintenance technicians, and serious DIYers who demand top-tier accuracy, reliability, and safety.

Expert Opinion: The Fluke 325 is a benchmark for quality in clamp meters. While it might cost more, its performance, accuracy, and longevity justify the investment for those who depend on their tools daily.

KAIWEETS Smart Digital Clamp Meter with D-Shaped Jaws,…

The KAIWEETS Smart Digital Clamp Meter is a fantastic blend of innovation and practicality. What really sets it apart is its upgraded intelligent mode which automatically identifies measurement signals for AC/DC voltage/current, resistance, and continuity. This feature is a real time-saver and makes operation incredibly straightforward, especially when you’re jumping between different tests. I also love the D-shaped jaws – they not only securely hold test leads but also enhance portability. The large HD color screen is brilliant for readability, even in challenging lighting conditions, and the inrush measurement function is invaluable for diagnosing motor startup issues.

Key features that stand out:
– Upgraded Intelligent Mode: Automatically identifies AC/DC voltage/current, resistance, and continuity, simplifying operation.
– Advanced Design & Multi-function: D-shaped jaws for portability and secure lead storage; includes MAX/MIN, data hold, flashlight, and auto-off.
– Large HD Color Screen: Offers superior readability in various lighting conditions.
– Self-test & Inrush Measurement Function: Ensures accuracy and helps diagnose motor startup problems (AC current only).

Pros:
– Intelligent mode simplifies usage for all skill levels.
– D-shaped jaws and color screen improve user experience.
– Inrush current measurement is a powerful diagnostic tool.
– Measures both AC and DC current.
Cons:
– The inrush function is only available for AC current, which may limit its diagnostic use for DC motor applications.

Best for: Electricians and advanced DIYers who appreciate smart features, easy readability, and specific diagnostic tools like inrush current measurement.

Expert Opinion: This KAIWEETS model is a smart choice for those seeking an intuitive experience without sacrificing advanced functionality. The intelligent mode and D-shaped jaws are clever design touches.

DigitPro Digital Clamp Meter Multimeter with D-Shaped Jaw,…

The DigitPro Digital Clamp Meter is a solid, feature-packed option that offers a lot of value. Its ability to deliver accurate True RMS readings for AC current up to 400A and AC/DC voltage up to 600V makes it versatile for a wide range of electrical tasks. Like its KAIWEETS counterpart, the unique D-shaped jaw design is a standout feature, making it incredibly convenient and safe to clamp onto various cables. I appreciate the user-friendly design, including the backlit screen and flashlight for dark environments, along with data hold and MAX-MIN functions. Knowing it’s passed international safety standards (CAT III 600V) also adds peace of mind.

Key features that stand out:
– Multifunctional Digital Clamp Meter: Provides accurate True RMS readings for AC current (400A), AC/DC voltage (600V), resistance, capacitance, diode, and continuity.
– D-Shaped Jaw: Unique design with up to 1.1-inch opening for convenient and safe clamping of various cables.
– User-Friendly Design: Backlit screen, flashlight, Data Hold/MAX-MIN functions, low battery indicator, and auto shut-off.
– Safe and Reliable: Passed international standards IEC61010-1, IEC61010-030, IEC61010-032, and rated CAT III 600V.

Pros:
– True RMS for accurate readings on complex waveforms.
– D-shaped jaw is a practical and safe design choice.
– Comprehensive feature set suitable for home and professional use.
– Comes with a complete premium support package including batteries and carrying case.
Cons:
– The auto-off function might be a minor annoyance for some users, though it can usually be disabled.

Best for: Homeowners, electricians, and technicians looking for a reliable, safe, and user-friendly True RMS clamp meter with a distinct jaw design.

Expert Opinion: The DigitPro is a well-rounded clamp meter that combines core functionalities with practical design elements like the D-shaped jaw. Its safety compliance and complete package make it a dependable choice.

KAIWEETS Digital Clamp Meter Multimeter with D-Shaped Jaw…

Here’s another great option from KAIWEETS, again featuring that distinctive D-shaped jaw that I find so practical for securing test leads and clamping cables. This True-RMS AC DC clamp meter is a robust tool, capable of accurately measuring AC/DC current, voltage, temperature, capacitance, and more. The NCV detection is a fantastic safety feature, quickly identifying live wires without physical contact, reinforced by both audible and visual alarms. What stands out to me is the user-friendly design with test lead storage, which is a small but brilliant touch for keeping your leads organized and protected. The added safety warnings for high voltage/current are a thoughtful addition.

Key features that stand out:
– TRUE-RMS AC DC Clamp Meter: Accurately measures AC/DC current/voltage, temperature (thermocouple included), NCV, capacitance, frequency, resistance, continuity, and diode.
– D-Shaped Jaw: Unique design with up to 1.1-inch opening for convenient and secure cable clamping and test lead storage.
– NCV Detection: Non-contact voltage testing with audible and visual alarms for quick and safe AC voltage detection.
– User Friendly: LCD backlight screen, flashlight, low battery indicator, auto shut-off, and integrated test lead storage.

Pros:
– True RMS for precise measurements across various electrical systems.
– D-shaped jaw and integrated lead storage improve usability and organization.
– NCV detection with alarms significantly enhances safety.
– Excellent customer service and safety certifications.
Cons:
– The screen turning orange for warnings is a helpful visual, but some might prefer a simpler, consistent display.

Best for: Electricians, automotive technicians, and DIYers needing a versatile, safe, and user-friendly True RMS clamp meter with smart design features.

Expert Opinion: This KAIWEETS model offers a comprehensive feature set for both AC and DC measurements, making it highly versatile. The D-shaped jaw and lead storage are genuinely practical enhancements.

Fluke 117/323 Kit Multimeter and Clamp Meter Combo Kit…

This Fluke 117/323 Kit is a powerhouse combo, giving you the best of both worlds: a precise digital multimeter (Fluke 117) and a capable clamp meter (Fluke 323). I’ve often found myself needing both functionalities on a single job, and this kit delivers. The Fluke 117 multimeter excels with True RMS and a low input impedance feature, which helps prevent those annoying false readings caused by “ghost voltage.” The Fluke 323 clamp meter measures 400A AC current and 600V AC/DC voltage with True RMS, ensuring accuracy even on non-linear signals. This kit is a professional-grade solution for a wide array of electrical diagnostics.

Key features that stand out:
– Dual Functionality Kit: Includes Fluke 117 Multimeter (AC/DC voltage, AC/DC amps, True RMS, low input impedance) and Fluke 323 Clamp Meter (AC current 400A, AC/DC voltage 600V, True RMS).
– True RMS on Both Devices: Ensures accurate measurements on non-linear loads and signals.
– Low Input Impedance (Fluke 117): Helps prevent false readings due to ghost voltage, a common issue.
– Professional Grade: Designed for reliability, accuracy, and safety in demanding environments.

Pros:
– Provides two essential, high-quality tools in one kit.
– True RMS on both devices ensures superior accuracy.
– Low input impedance on the 117 is a significant advantage for troubleshooting.
– Fluke’s legendary build quality and reliability.
Cons:
– The combined cost of the kit is a significant investment, potentially more than a single all-in-one clamp meter.

Best for: Professional electricians, HVAC technicians, and serious electrical contractors who need dedicated, high-performance tools for both general troubleshooting and current measurements.

Expert Opinion: This kit is an investment, but for professionals who demand the absolute best in accuracy and reliability for both direct and clamped measurements, it’s an unparalleled choice.

ZIBOO 69140 K-Type Thermometer, Pipe Temperature Clamp for…

While not a full multimeter clamp itself, the ZIBOO 69140 is an incredibly valuable accessory that complements any digital multimeter or clamp meter that measures temperature. I’ve used similar pipe clamps for HVAC work, and the ability to accurately measure pipe temperatures from -40 to 392°F is essential for diagnostics. Its versatile design clamps around pipes from 1/4 to 1½ inches in diameter, making it suitable for a wide range of applications. The 39.78-inch flexible lead offers convenient positioning, and its universal compatibility with a banana plug adapter means it’s ready to integrate with most professional meters.

Key features that stand out:
– Wide Temperature Range: Measures from -40 to 392°F (-40 to 200°C) with ±2% accuracy.
– Versatile Pipe Clamp: Clamps around pipes from 1/4 to 1½ inches in diameter.
– Flexible Lead: 39.78 inches long for convenient temperature measurements.
– Universal Compatibility: Works with any digital multimeter or clamp meter that supports K-Type thermocouples and measures temperature.

Pros:
– Specifically designed for accurate pipe temperature measurements.
– Wide clamping range fits various pipe sizes.
– Long, flexible lead for easy placement.
– Compatible with most standard multimeters and clamp meters.
Cons:
– This is an accessory, not a standalone meter, so you still need a compatible multimeter to use it.

Best for: HVAC technicians, refrigeration professionals, and anyone needing accurate temperature measurements on pipes, especially when paired with a multimeter clamp that includes temperature functions.

Expert Opinion: This is a crucial accessory for HVAC professionals. Its dedicated design for pipe temperatures offers far more convenience and accuracy than standard probe thermometers.

MESTEK Digital Clamp Meter Multimeter TRMS 6000 Counts…

The MESTEK Digital Clamp Meter offers an impressive array of features for its price, making it a strong contender for both home and light professional use. Its True-RMS AC DC capabilities measure up to 600A AC/DC current and 600V AC/DC voltage, alongside resistance, capacitance, continuity, temperature, and diode. I really appreciate the Non-contact Voltage Testing (NCV), which is quick and safe for detecting live circuits. The VFD and LoZ modes are particularly useful, providing more accurate readings in environments with variable frequency drives or to prevent ghost voltage. With a backlit screen, LED flashlight, and a zero function to reduce magnetic field errors, it’s designed for practical, accurate work in various conditions.

Key features that stand out:
– True-RMS AC DC Clamp Meter: Accurately measures 600A AC/DC current, 600V AC/DC voltage, resistance, capacitance, continuity, temperature, and diode.
– Non-contact Voltage Testing (NCV): Safely and quickly detects voltage without physical contact, with added VFD and LoZ modes for accuracy.
– Easy to Read: Backlit screen and LED flashlight for clear readings in dim conditions.
– Multi-Function: Includes Data Hold, True-RMS, Automatic Range, Auto power off, Zero function, and full range overload protection.

Pros:
– Comprehensive True RMS measurements for both AC and DC.
– NCV, VFD, and LoZ modes enhance safety and accuracy.
– Excellent visibility with backlit screen and flashlight.
– Good safety ratings (CAT III 1000V, CAT IV 600V) and overload protection.
Cons:
– The plastic feel, while durable, may not feel as premium as some higher-end brands.

Best for: DIYers, auto mechanics, and aspiring electricians looking for a feature-rich, safe, and accurate True RMS clamp meter for a wide range of applications.

Expert Opinion: MESTEK has packed a lot of functionality into this meter. The inclusion of VFD and LoZ modes at this price point is particularly noteworthy, offering advanced diagnostic capabilities for more complex systems.

ZKH Inrush Digital Clamp Meter Multimeter, 1000A Amp Clamp…

The ZKH Inrush Digital Clamp Meter is a serious tool designed for serious diagnostics, particularly for motors and industrial applications. This 6000-count true-RMS clamp meter impresses with its high current capacity, measuring 1000A AC/DC current and 1000V DC/750V AC voltage. What truly makes it stand out is the Inrush Current Meter function, which is invaluable for quickly pinpointing motor startup problems – I can’t stress enough how much time this saves. The VFD Mode ensures precise measurements on variable frequency drives, crucial for modern industrial equipment. Combined with NCV detection, a backlit LCD, and thoughtful design features like Data Hold and Max/Min, this is a comprehensive solution for professionals.

Key features that stand out:
– Advanced and Versatile: 6000-count true-RMS measures 1000A AC/DC current, 1000V DC/750V AC voltage, capacitance, frequency, duty cycle, resistance, diode, continuity, and temperature.
– Inrush Current Meter: Measures maximum current at machine startup, helping diagnose motor and circuit issues (AC current only).
– VFD Mode: Ensures precise current and voltage measurements on variable frequency drives.
– Non-Contact Voltage Detection (NCV): Provides safe voltage testing without physical contact.

Pros:
– High current capacity (1000A) suitable for heavy-duty applications.
– Inrush current measurement is a powerful diagnostic feature.
– VFD mode for accurate readings on industrial equipment.
– Measures both AC and DC current/voltage.
Cons:
– The inrush function is limited to AC current, which is a common limitation but still worth noting.

Best for: Professional electricians, industrial maintenance technicians, and automotive specialists who regularly work with high currents and complex motor systems.

Expert Opinion: For demanding industrial and commercial applications, the ZKH Inrush Clamp Meter is a robust and highly capable device. Its 1000A capacity and dedicated inrush/VFD modes make it an excellent choice for advanced diagnostics.

Helpful Comparison Insights

When you’re sifting through these excellent options, it’s helpful to think about what really matters for your specific use.

If AC/DC flexibility is paramount, then meters like the FNIRSI DMC-100, Fluke 325, KAIWEETS Smart, DigitPro, MESTEK, and ZKH Inrush are your go-to choices, as they all offer both AC and DC current measurement. The AstroAI, while great for AC, won’t cut it if you’re dealing with DC systems like solar or automotive.

For True RMS accuracy, which is crucial when dealing with non-linear loads common in modern electronics, almost all our top picks deliver: FNIRSI DMC-100, Fluke 325, KAIWEETS Smart, DigitPro, KAIWEETS Digital, Fluke 117/323 Kit, MESTEK, and ZKH Inrush. This ensures your accurate measurements are truly accurate, regardless of waveform distortion.

When safety and professional-grade reliability are non-negotiable, the Fluke 325 and the Fluke 117/323 Kit truly shine. Fluke’s reputation for robust build and superior safety ratings (CAT III/IV) is well-earned, making them investments for serious professionals. However, don’t overlook the strong safety standards met by DigitPro, KAIWEETS Digital, and MESTEK, which also provide excellent protection.

If you’re looking for advanced diagnostic capabilities, the ZKH Inrush takes the lead with its impressive 1000A current capacity, dedicated inrush current function, and VFD mode for variable frequency drives. The KAIWEETS Smart also offers inrush measurement, while the MESTEK includes VFD and LoZ modes. These features are invaluable for diagnosing motor issues or complex industrial systems.

For user experience and modern display technology, the FNIRSI DMC-100 with its HD full-color TFT screen and the KAIWEETS Smart with its large HD color screen are clear winners. They offer better readability and a more engaging interface than traditional monochrome LCDs, making work in various lighting conditions easier.

Finally, consider budget and value. The AstroAI Digital Clamp Meter offers excellent basic AC functionality at a very accessible price point. For a significant step up in features without a Fluke-level investment, the FNIRSI DMC-100, KAIWEETS Smart, DigitPro, and MESTEK all provide incredible value, packing True RMS, AC/DC current, and advanced features into a more affordable package. The ZIBOO K-Type clamp is a specialized accessory, so remember it requires a compatible meter.

Final Verdict

Choosing the best multimeter clamp reviews for accurate measurements really boils down to your specific needs and how you plan to use it.

If you’re a homeowner or a beginner DIYer primarily dealing with basic household electrical checks and needing an affordable entry point, the AstroAI Digital Clamp Meter Multimeter is a fantastic choice, especially if AC-only measurements suffice.

For the advanced DIYer or a general technician looking for a feature-packed device that offers great value, both KAIWEETS Smart Digital Clamp Meter (with its intelligent mode and inrush current) and the MESTEK Digital Clamp Meter Multimeter (with VFD and LoZ) stand out. The FNIRSI DMC-100 also offers a compelling package with its color display and data logging for a modern user experience. These provide robust accurate measurements for a wide array of tasks.

Now, if you’re a professional electrician or an industrial technician who needs top-tier accuracy, extreme reliability, and advanced diagnostic capabilities for high-current and complex systems, the Fluke 325 Clamp Multimeter or the comprehensive Fluke 117/323 Kit are industry standards for a reason. For heavy-duty applications and critical motor diagnostics, the ZKH Inrush Digital Clamp Meter Multimeter is a powerhouse with its 1000A capacity and specialized functions.

Ultimately, each of these best multimeter clamp reviews for accurate measurements offers unique strengths. Weigh your requirements carefully, and you’ll find a tool that empowers you to tackle any electrical challenge with confidence and precision.

Comprehensive FAQ Section

Q1: What is a multimeter clamp, and why would I need one for accurate measurements?
A: A multimeter clamp, often called a clamp meter or amp clamp, is an electrical test tool that combines a basic digital multimeter with a current sensor. The “clamp” part allows you to measure AC or DC current flowing through a conductor without breaking the circuit or making physical contact with the wire itself. This is incredibly useful for accurate measurements because it’s safer, faster, and more convenient than traditional in-line current measurement. You’d need one to diagnose electrical issues, check current draw of appliances, troubleshoot automotive or solar systems, and ensure safe electrical operation.

Q2: What’s the difference between AC and DC current measurement in a clamp meter?
A: AC (Alternating Current) is what typically powers your home appliances, while DC (Direct Current) is found in batteries, automotive systems, and solar panels. Many entry-level clamp meters only measure AC current. However, to truly get the best multimeter clamp reviews for accurate measurements across a wide range of applications (especially automotive, solar, or industrial), you’ll want a clamp meter that can measure both AC and DC current. Always check the product specifications carefully.

Q3: Why is “True RMS” important when choosing a multimeter clamp for accurate measurements?
A: RMS (Root Mean Square) is a measure of the effective value of an AC waveform. A “True RMS” clamp meter can accurately measure both pure sinusoidal (smooth wave) and non-sinusoidal (distorted wave) AC waveforms. Many modern electronic devices, such as computers, LED lights, and motor drives, produce non-sinusoidal waveforms. If your clamp meter isn’t True RMS, its readings on these distorted signals will be inaccurate. For reliable and accurate measurements in today’s electrical environments, True RMS is highly recommended.

Q4: What are “NCV” and “Inrush Current” features, and how do they aid accurate measurements?
A: NCV (Non-Contact Voltage) detection allows you to detect the presence of AC voltage in a wire or outlet without making physical contact. It’s a fantastic safety feature for quickly identifying live circuits before you start working. Inrush Current measurement is a specialized function that captures the very high, momentary current surge when electrical equipment (like a motor or transformer) first starts up. This surge can be many times higher than the normal operating current. Measuring inrush current helps diagnose startup problems in motors, power supplies, and other inductive loads, providing a more complete picture for accurate troubleshooting.

Q5: What safety ratings (CAT ratings) should I look for in a clamp meter?
A: Safety ratings, typically indicated as CAT II, CAT III, or CAT IV, specify the maximum transient overvoltage a meter can safely withstand.
* CAT II: Used for measurements on circuits connected to standard wall outlets.
* CAT III: For measurements on distribution level circuits (e.g., within a building’s main panel, fixed installations, motor connections).
* CAT IV: For measurements on the primary supply side (e.g., utility service entrance, outdoor conductors).
Higher CAT ratings (e.g., CAT III 600V or CAT IV 600V) indicate greater protection against voltage spikes and are crucial for professional use to ensure your safety and get consistently accurate measurements.

Q6: Can a clamp meter measure temperature, and is a K-Type thermocouple attachment useful?
A: Yes, many modern clamp meters, especially those highlighted in our best multimeter clamp reviews for accurate measurements, include a temperature measurement function, often using a K-Type thermocouple. A standard probe-style thermocouple is usually included. However, an accessory like the ZIBOO 69140 K-Type Thermometer Pipe Clamp is incredibly useful, particularly for HVAC or refrigeration technicians. It allows you to clamp directly onto pipes for accurate surface temperature readings, which is essential for diagnosing heating, cooling, or flow issues without needing to physically insert a probe.