The detection range of metal detection instruments on the market is generally as follows:
① The small hand-held metal detector is 1~40cm deep, which is used for short-distance accurate positioning and security inspection.
② The hand-held probe disc underground metal detector is 1~2m deep, which is used in outdoor treasure exploration, engineering exploration and other fields. The machine with synchronous multi frequency technology can also search for gold and silver jewelry on high salinity beaches.
③ Pulse type metal detector is used to filter small objects and search large underground metal objects in a carpet way. The detection depth can be up to 3-4 meters. In any form of metal detector, the size of the metal object determines the depth of detection. For example, the longest used hand-held probe disk metal detector, copper coin dozens of centimeters, the larger the object, the stronger the signal, the better the depth. According to the performance difference between high and low ends, the limit depth is in the range of 1-2 meters.
