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Thanks for the replies. We got it for testing voltages on a PCB in the boiler as a diagnostic tool when the boiler stopped working. We do seem to get through a lot of light bulbs, and he thinks that this could be a problem with the earth. He got a reading of 12V from one radiator but not a...

Yes, it is a contact tester - a pen-type voltage tester. It has two buttons, one says "inductance breakpoint test" and the other "direct test". It looks like this one from B&Q http://www.diy.com/departments/bq-pen-type-voltage-tester/177924_BQ.prd Thanks

I wonder if any electrical experts can offer some advice? My husband has acquired a mains voltage tester and has been going round the house sticking it on metal objects, like the gas fire, a radiator, a metal ceiling light fitting and the screws on a wall light switch. Some of them are...