HV 50 Designed for 3KV to 50KV AC 50 Hz overhead lines in EHV switchyards & similar installations. Indicates the presence of HIGH VOLTAGE by audio as well as visual annunciation. Powered by a single 9V battery. Current Consumption: 30mA maximum. Available Varients 1. HV132 - Detection Range 11KV to 132 KV 2. HV220 - Detection Range 33 KV to 220 KV 3. HV440 - Detection Range 66 KV to 440KV