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useless isnt the word i had an electrition come round last night and he said the earth readings on my sockets were different my house is pretty big with over 100 sockets and 3 fuse boxes how do you test what earth reading you have on the sockets?

hi, i had a central heating engineer come round to install a new system, however when he checked the sockets he said i had a variable earth i asked him how he got that reading and he didnt know - can anyone tell me how to check what reading you have on your earth on your sockets