Extech MA443 True Rms 400A AC Clamp Meter with Ncv Green

Extech MA443 True Rms 400A AC Clamp Meter with Ncv, Green


The Extech MA443 is a versatile and reliable 10 function, 400A true rms AC clamp meter with an integrated non-contact voltage (NCV) detector. This compact clamp meter also features type K temperature measurement, making it a comprehensive tool for electrical professionals.

Accurate Readings

One of the standout features of the MA443 is its true rms capability, which ensures accurate readings regardless of waveforms. This is particularly useful when dealing with non-linear loads or distorted waveforms. With the MA443, you can trust that your measurements are precise and reliable.

Convenient Design

The MA443 is designed with convenience in mind. Its 1.2″ (30mm) jaw size allows it to fit conductors up to 500Mcm, making it suitable for a wide range of applications. The large backlit LCD display ensures easy readability even in low-light conditions, and the built-in flashlight provides additional illumination when needed.

Multiple Functions

This clamp meter offers a variety of functions to meet your measurement needs. It can measure AC/DC voltage, AC current, resistance, capacitance, frequency, and even perform diode tests and continuity checks. The included general purpose type K temperature probe allows for temperature measurements as well.

Additional Features

The MA443 also includes a relative mode for capacitance, data hold, max/min function, auto power off, and a low battery indicator. These features enhance the usability and convenience of the clamp meter, ensuring accurate and efficient measurements.

Frequently Asked Questions

1. Can the MA443 measure both AC and DC current?

Yes, the MA443 is capable of measuring both AC and DC current.

2. Is the clamp meter safe to use?

Absolutely. The MA443 has a Cat III 600V safety rating, providing peace of mind during use.

3. How long do the batteries last?

The MA443 comes with three AAA batteries, and their lifespan will depend on usage. However, the clamp meter also has an auto power off feature to conserve battery life.


The Extech MA443 True Rms 400A AC Clamp Meter with Ncv is a reliable and versatile tool for electrical professionals. With its true rms capability, convenient design, and multiple functions, it offers accurate and efficient measurements for a wide range of applications. Whether you’re a professional electrician or a DIY enthusiast, the MA443 is a valuable addition to your toolkit.