The Manta Ray, made by Berkeley Varitronics Systems, can find phones through walls and other barriers even if their batteries and SIM cards are removed. Metal detectors can't distinguish between cellphones and other objects made with metal, and some phones have only small amounts of metal to be detected, Schober said. Whites Coinmaster Metal Detector Review Detectorly
In most cases, one metal detector will do it all except for specialized situations. So nugget detectors and underwater ones wont be good for more geneal detecting.
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