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It can be used for public security in airports, Railway stations, docks, prisons, customs and frontier defense as well as Quality control of medicine, food and other commodities.It is a high performance Hand Held Metal Detector designed to meet the exact Requirements of the security industry. The detector is now operational although and increase in sensitivity and depth range can be achieved by turning the sensitivity adjuster until the LED turn to red and a constant audio tune is heard.. Turn the sensitivity adjustor (anti-clockwise) until the red LED just turn to green the tone fades.Typical uses will include body search For offensive weapons like knife, gun and so on, Detecting metal articles for Factory and store etc.Sound alert LED indicator.If the detector is held still over a metal object the detection signal will automatically reduce.