... -up. 2.In police stations, courts for detection and search. 3.Checking the metal objects in parcels and luggage. 4.Detecting the ... , or in the archaeological search. 6.Detecting wires, tubes beneath the earth. 7.Searching for the jewelry and metal cultural relic, buried ... signal is of the metal or of the effect. The SL-2D metal detector has been equipped with advanced ground balance system, and it ...