Check the listing for details. NEW Durable Klein Tools Standard/GFCI Outlet Tester Detect Wiring Problems. Condition: New. Listed at 15.99 USD. Klein Tools 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 lights results. Conditions indicated: open ground, reverse polarity, open hot, open neutral, hot/ground reversed. GFCI Outlet Tester detects the most common wiring problems in standard and GFCI receptacles Electrical outlet tester works on GFCI outlets and confirms operation of the ground fault protective device Built to withstand a 6.6 ft. (2 m) drop Operating temp: 32-Degree to 140-Degree Fahrenheit (0-Degree to 40-Degree Celsius) Nominal Voltage: 110/125V AC at 50/60Hz in 3-wire outlet Dimensions Product Depth (in.) 1 in Product Height (in.) 3 in Product Width (in.) 1.69 in Details Control Type Manual/Analog Display Type LED Electrical Tools Features No Additional Features Included Reference Scale Measures/Detects Polarity Product Weight (lb.) .08 lb