Electric Fence Voltage Tester Instruction Sheet GENERAL DESCRIPTION The tester uses neon lamps to indicate voltage produced on a fence line or by a fence controller. It is designed for low impedance and standard duty fence controllers. WARNING . The tester can only be used fo test standard duty, low Impedance electric fences. People with pacemakers should not use the taster Keep the tester dry. Don't use the tester If the tester or your hand Is wet Inspect the tester before use.