Silverline - NON-CONTACT VOLTAGE DETECTOR - 675220 Used to detect voltage in outlets, light fixings, circuit breakers, wires and cables or to find beraks in wires. LED and audible alarms.Voltage detection 50-1000V AC, frequency 50-500Hz Measurement category ACT 11, 1000V per UL3111-1Cat 1V, 600V per IEC61010-1.