Moving Coil Meter Analogue Insulation Tester @ 250/500/1000 V DC, 400 MΩ
Every electrical apparatus and installation need to be safe for the user and for the equipment itself. Electrical conductors of electricity need to be insulated from each other, so that they do not create electrical hazard. Badly insulated circuits can create leakage current which can be dangerous and trip your GFCI, RCCB or ELCB. Each country regulates those levels at which the insulation is acceptable. Check the continuity of wires, complete circuits connections, closure of contacts, circuit breakers, fuses, bounding resistance of connections, etc. are all very important.