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Greenlee's Calibration Loop (Part No. CMGRT-CL) is specifically designed to confirm accuracy for the popular CMGRT-100A Greenlee Pushbutton Test Instruments. This compact calibration loop is engineered to offer reliability and performance in various electrical applications, with its inch FNPT adapter thread fitting. The versatile design of this tool allows it to fit into tight spaces with ease while providing an accurate voltage reading up to 600V AC or DC. The calibration loop can be used for a wide range of test and measurement equipment including multimeters, clamps, and other electrical test tools. It's perfect for field service technicians, electricians, maintenance personnel or anyone who needs to confirm the accuracy of their electrical test instruments quickly and efficiently. With its ease of use and compact design, Greenlee's Calibration Loop will be a valuable asset in any toolbox.