Klein Tools HVNCVT-1 Dual Range High Voltage TesterKlein Tools HVNCVT 1 The Dual Range Non Contact Tester checks for the presence of voltage in overhead conductors or finds faults in cables. The LOW range detects 50V AC to 1. 5kV AC. The HIGH range detects 1. 5kV AC to 132kV AC. The tester indicates the presence of voltage with both audible and visual signals. Use to check for the presence of voltage in overhead conductors or find faults in cables LOW range for 50V AC to 1. 5kV AC HIGH range for 1.