Detects cables, studs and floor joists, no problems. However a bit of common sense is needed when using detectors like this as you need to be aware that material densities are being scanned and may give you a different result that you expect. For instance, if you have a foil backed plasterboard, it will detect metal everywhere, which is correct as metal foil is dense. In my case I have used foil coated insulation board between studs, therefore the scanner reported metal and flashed red, until it reached a stud when its metal reading reduced which enabled me to detect the studs correctly. In my opinion the bad reviews are from people who do not understand how this is working.
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