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I've got this one. Seems fine - has found studs accurately.
What i have done is mark it on the wall when found then scan above/below a foot or two to check it's not a false positive. Slow sweeps work well.
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They are only part of the process. I've never come across one that can be relied on exclusively. Bear in mind that joists are usually evenly spaced (but not always). Quite a lot depends on the age of the walls. If it's been put up in the last 15 years you should have regular spacing of joists and wiring running only horizontal or vertical from an accessory. There is an area at the edges of walls which is allowed for wiring. That used to catch a lot of kitchen fitters out, especially since there's almost always a cupboard hanging required there.
Apparently a small neodymium magnet can be employed to find p/b nails or screws, not had to use that method but it seems pretty decent.
All the walls in our kitchen are plasterboard, as I want to hang some cabinets I think I'll need a studfinder. Any recommendations? There are 3 or 4 different models on Amazon priced around £25 and with virtually identical features, what should I look for? Or are the cheap ones all shit, and should I get a Bosch or some such?