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