by Extech
Last updated Mar 29, 2026 · 2 revisions
400A True RMS AC/DC clamp meter with 11 functions including capacitance, Type K temperature, NCV detector, and inrush current for HVAC field work.
The Extech MA445 is a compact 400A True RMS AC/DC clamp meter with 11 measurement functions suited for HVAC technicians. It measures AC/DC voltage and current, resistance, capacitance, frequency, duty cycle, temperature via Type K thermocouple, and includes a non-contact voltage detector. The 1.2-inch jaw fits conductors up to 500 MCM, and the dual backlit display with inrush current mode simplifies motor startup diagnostics.
How this product is delivered and what's included out of the box.
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