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The CLAMP-GUN™ M12™ Cordless Clamp Meter for HVAC/R is a heavy duty True-RMS current tester for professional HVAC/R commercial and industrial applications. Powered by the Milwaukee M12™ LITHIUM-ION battery, the 2238-21 features an ergonomic pistol grip design which greatly increases comfort and ease-of -use in overhead applications. The unit also provides a wide 1.30" jaw opening (measuring up to 750 MCM cable) to easily handle large conductors, a thin jaw profile for access to tight spaces, a large white on black display, embedded non-contact voltage detection and an embedded extra bright LED Floodlight. Wide Current Range to 600 Amps AC/DC. Wide Voltage Range to 1000 Volts AC/DC. 600 microamps DC for Flame Rectification. K-type thermocouple for contact temperature measurements. The 2238-21 is covered by the Milwaukee 5-Year Warranty.