... of fun MD5008 Security Metal Detectors :Main features: 1,a balance between the lines, to eliminate "mineralization response" to the ... increasing the effective detection of the depth and accuracy: 2, a difference between black metal and non-ferrous metals function; 3,operating ... products parameters: 5,maximum depth of exploration: small capitalization 1.5 meters, 3.5 meters market signal frequency: 7 ...