These Sofamel VTM voltage detectors alert the operator with a high-brightness red LED and high acoustic pressure buzzer when the presence of voltage is detected. The absence of voltage is indicated by a green LED of high luminosity. The advanced technology guarantees a perfect and safe indication even in conflicting electric field environments. Six models are available - 3 to 10 kV, 4 to 12 kV, 10 to 30 kV, 15 to 45 kV, 11 to 33 kV, and 22 to 66 kV.