I bought this unit to check on my car circuits and trailers and a caravan. It perfectly fulfills its role and shows you all the circuit functions. Do not ask him to recognize each element is performed if a repair or construction. But this is not done for .. The manual is not very good, you could say you have to put it quu'il a stack! and some paragraphs are contradictory. The seller got nothing to say against: Fast delivery and quickly and courteously respond to a request for information. Bravo