Klein RT210 GFCI Outlet Tester Receptacle Testers are designed to detect the most common wiring problems in standard and GFCI receptacles. A convenient chart on the tester helps determine wiring condition in outlet, based on LED lights results. Conditions indicated: open ground, reverse polarity, open hot, open neutral, hot/ground reversed.GFCI Tester detects the most common wiring problems in standard and GFCI receptaclesWorks on GFCI outlets and confirms operation of the ground fault protective deviceBuilt to withstand a 6.6-foot (2m) dropOperating temp: 32-Degree to 140-Degree Fahrenheit (0-Degree to 40-Degree Celsius)Nominal Voltage: 110/125V AC at 50/60Hz in 3-wire outletSpecifications:Type: GFCI and Standard Receptacle TesterApplication: Determine Wiring Condition in OutletSpecial Features: Convenient Chart on the TesterDrop Protection: 6.6' (2 m)GFCI: YesVoltage: 110/125V AC at 50/60Hz in. 3-Wire OutletOverall Length: 1.62'' (4.1 cm)Overall Height: 2.88'' (7.3 cm)Overall Width: 1.88'' (4.8 cm)Weight: 1.9 oz (54 g)UPC: 92644690273