Voltcraft ms 258 ii multi tester voltcraft ms 258 ii p the voltcraft ms 258 ii multi tester detects ac voltages in electrical sockets switches fuse boxes cables etc its adjustable sensitivity makes it ideal for detecting live conductors in sockets in addition the metal detector function may be used to find metal parts such as nails cables in walls and ceilings etc or check the earthing of the metal casings on electrical appliances p p the instrument is also suitable for testing