Receptacle Tester - Ideal for 110-125 VAC 3 wire receptacles. Tester indicates: Open ground, open hot, open neutral, hot/ground reverse, hot/neutral reverse and correct - By Katzco IDEAL FOR HOUSEHOLDS  This receptacle tester is ideal for any household. 110-125 Voltage is common among many households which makes it super convenient to have around just in case. SAFE TO USE  Circuit tester is safe to use and application is simple as well. Simply plug into any 3 prong receptacle outlet and avoid any hand contact with electrical currents. LIGHT INDICATORS  Indicators detect any problems in standard receptacles. Lights indicate if wiring is correct, open ground, revere polarity, open hot, open neutral, and hot/ground reversed DOESNT INDICATE  Quality of ground, multiple hot wires, combinations of defects, reversal of grounded and grounding conductors. SUPER CONVENIENT - The compact size of this receptacle outlet tester makes for easy storage and accessibility wherever you need it. All you need to do is plug in and observe the light patterns to detect wiring problems