The Faithfull multi-tester is more than just a conventional voltage tester. The built in battery powered sensor allows the multi-tester to perform a number of different functions without the need to dismantle a suspected faulty item or have any contact with live parts. The multi-tester is fully insulated and is supplied complete with full operating instructions and will perform the following tests: continuity,bulbs, fuses, short circuits, cable tracking, mains sockets and microwave oven leakage. SAFETY NOTEAlways read and the instruction supplied with the multi-tester.Never use a multi-tester until you are fully conversant with its use and applications. Never work on live equipment, and if in any doubt, always contact a qualified electrician.