The Milwaukee Clamp Meter 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" 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 Nn-contact voltage detection and an LED work light to increase end user productivity. Covered by Milwaukee 5-Year Warranty.