12-Volt to 1000-Volt AV Dual Range Non-Contact Voltage Tester The NCVT-2P is a non-contact voltage tester The NCVT-2P is a non-contact voltage tester that detects 12 to 1000V AC and indicates the presence of voltage in cables, cords, circuit breakers, light fixtures, switches, outlets and wires as well as AC voltage in doorbells, thermostats, low voltage lighting and irrigation systems.