Multi Scanner & i 500 One Step wall scanner easily & accurately locates studs joists metal & live electrical wire. Zircon-exclusive Center Vision technology finds the centre of studs & joists in a single pass. A 4-mode switch provides instant access to all functions & an ultra-bright LCD screen indicates direction edge & centre of studs. An ultra-bright LCD screen indicates direction edges & centre of studs. Stud scan mode finds metal or wood studs & joists up to 19 mm. deep. Deep Scan & mode probes further locating studs up to 38 mm. deep behind drywall paneling or plywood. Metal mode detects ferrous metal such as rebar or steel pipe up to 76 mm. deep & non-ferrous metal such as copper pipe up to 38 mm. deep. AC scan finds & traces live electrical wire (not shielded by metal). Spot Lite & Pointing System & audio alert automatically identify the target. In stud or metal modes Wire. Warning & alert detects the presence of unshielded hot electrical wiring.