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  • Got a used Bosch GMS120 on eBay for £20 the other day. Not sure if that’s the same as you already have but so far so good. Has detected wires. Haven’t tried to find a stud etc.

  • Without wanting to sound patronising, are you following the instructions fully? My old Bosch one has a method of calibrating itself when you switch it on. Mind you, it's only one tool for divining pipes and wires and rarely the first one I'd use.

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