The Milwaukee® clamp meter (NIST) is a heavy duty True-RMS electrical current tester for professional residential, commercial and industrial applications. The perfect tool for the professional electrician, the 2237-20 clamp meter provides a wide 1.3 in jaw opening to easily handle large conductors, a thin jaw profile for access to tight spaces and a high contrast white on black display for clearer readings. In addition, the Milwaukee® clamp meter was designed with embedded non-contact voltage detection and an LED work light to increase end user productivity. 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. Covered by Milwaukee® 5 years warranty. Milwaukee® Clamp Meter, 600 A, 600 VAC Electrical Rating, 6 kOhm Resistance, 1.4 in Jaw, Reverse Black LCD Display, Safety Rating: CAT III, 14 to 122 °F Operating, 9-1/2 in L Dimensions, Black/White