Klein Tools NCVT5KIT Dual Range NCVT and GFCI Receptacle Tester Electrical Test KitNCVT 5A provides non contact determination of AC voltage in cables, cords, circuit breakers, switches, outlets and wires, as well as AC voltage in security, entertainment, communications, environmental control and irrigation systems Dual range testing: select 12 to 1000V AC which is perfect for low voltage systems such as doorbells, environmental control or irrigation systems, or select 70 to 1000V AC which is perfect for detecting systems such as