The Klein Tools NCVT1 Non-Contact Voltage Tester, 50-1000V AC is designed to check for the presence of voltage in cables, cords, circuit breakers, lighting fixtures, switches, outlets, and wires. This model measures up to 1000V AC. The NCVT-1 indicates the presence of voltage through both audible and visual signals. Microprocessor controlled low-battery indicator and auto power-off functions conserve and extend the battery life of the tester.