This device is designed to perform simple electrical safety tests on any type of medical equipment, whenever patient lead testing is not required.The rugged, hand-held instrument is built for quick and easy use. A simple selector knob controls the functions: Leakage Current and Chassis Resistance. Accurate test measurements are shown on the large display.Heavy-duty switches change polarity, open and close the neutral and select Chassis or Earth Leakage Current measurements. A four-wire Kelvin bridge eliminates reading errors in resistance due to cable length and contact resistance. True RMS measurements are provided for all current readings. The AAMI test load is utilized.