Fluke Corporation FLUKE-7-600 Automatic Electrical Tester This electrical tester is designed for safe, automatic measurements of AC volts, DC volts, resistance and continuity Simply turn on and use Auto selection simplifies voltage measurements in power environments When measuring ohms/continuity with more than 4.5 volts present across the input jacks (intentional or not) the meter automatically switches to measuring ac or dc volts, whichever is greater Input impedance is approximately 2kOhms, helping determine is voltage is from leakage, so-called "ghost" voltages, or a hard connection