金属埋在地下，透过厚厚的土层去探测，必然受到地质结构的影响。地层中含有各种各样的矿物质，他们也会使金属探测产生信号，这些矿物的信号会掩盖掉金属的信号而造成假象。用过旧时金属探测器的人都有这种体会，随着探头靠近土堆、石块、砖头都会发出报警声，这种现象称为“矿化反应”。
Metals buried underground and detected through thick soil layers are bound to be affected by the geological structure. There are various minerals in the stratum, and they can also make metal detection produce signals, which can mask the signals of metals and create false impressions. People who used old metal detectors all have this experience. As the detectors approach the earth heap, rocks and bricks, alarm sounds will be emitted. This phenomenon is called "mineralization reaction".
由于这个原因，旧式金属探测器只能探测到浅土中的金属，对深埋地下的金属目标无能为力。地下金属探测器装有先进的地平衡系统，能排除“矿化反应”的干扰，大大提高了仪器的探测深度跟效果。
For this reason, the old metal detectors can only detect the metal in shallow soil, and can not do anything for the metal targets buried deep underground. The underground metal detector is equipped with advanced balance system, which can eliminate the interference of mineralization reaction and greatly improve the detection depth and effect of the instrument.