The CLAMP-GUN™ M12™ Cordless Clamp Meter (NIST) is a heavy duty True-RMS current tester for professional commercial and industrial applications. Powered by the Milwaukee M12™ REDLITHIUM™ battery, the 2239-21NST 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 to easily handle wire bundles, 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. A NIST Certificate of Calibration with Data is also included, needed by many organizations as proof of calibration with the date when NIST Calibration was performed. The 2239-21NST is covered by the Milwaukee 5-Year Warranty.