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are you following the instructions fully?
Yes. I think so. I recalibrate it quite often. Remove watch and wedding ring. Make sure I'm wearing the correct shoes.
Anything I'm missing?*
Quite a few reviews online have the same problem.
*just remembered I was forgetting about putting my hand on the wall to ground it!
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Mine is a bit of a game as well, it needs to be away from the wall etc. etc. but I sometimes get good results if I switch it on and let it calibrate while it's on the wall. Mine's also got means to make it stand off the wall a set amount.
Both of mine gather dust anyway, last time we discussed them in this thread the only person who had used a decent one said it worked well but cost a lot of money.
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.