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The CLAMP-GUN™ M12™ Cordless Clamp Meter is a heavy duty True-RMS current tester for professional commercial and industrial applications. Powered by the Milwaukee M12™ LITHIUM-ION battery, the 2239-21 features an ergonomic pistol grip design which greatly increases comfort and ease-of-use in overhead applications. The unit also provides a wide 1.57" jaw opening (measuring up to 1000 MCM cable) to easily handle very large conductors, a thin jaw profile for access to tight spaces, a large white on black display, embedded non-contact voltage detection and embedded extra bright LED Floodlight. Wide Current Range to 1000 amps AC/DC. In-rush current measurement for motor starts. Wide Voltage Range to 1000 volts AC/DC. Frequency measurement from 6 Hz to 6 kHz. The 2239-21 is covered by the Milwaukee 5-Year Warranty.