Hope someone can help. We had a washing machine delivered on hire, the guy put an impedance tester into the socket and the reading showed over 100 holmes. He tried it in 4 other sockets down stairs and got the same kind of reading. I assume this is to do with the earthing in the house and I don't know what I need to do, or what needs to be done. Getting an electrician in is maybe the obvious answer but I need to understand what might need doing. Thanks in advance for feedback. PS they wouldn't deliver the washing machine.