Make you right about thieves. But you can put your own serial number on test sheet it just has to match a tester. In fact the label fell off one of my testers the other day , so it can happen.
Still like you I reckon that tester is a bit moody.
I never buy second hand tools. But some of the...
sorry chaps, I misread op, i thought he meant there was only one single socket in a room.
http://www.esc.org.uk/fileadmin/user_upload/documents/industry/best_practice/BestPracticeGuide4-Locked.pdf check out page 6.
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