Answer: The detection depth of all metal detection instruments has a great relationship with the area, shape and weight of the metal being detected. Generally speaking, the larger the area and the greater the quantity, the greater the corresponding detection depth; conversely, the larger the area, the greater the quantity. Small, the smaller the number, the smaller the corresponding depth. The depth marked by the instrument is the maximum depth that can be achieved under optimal conditions according to the industrial standards of the product. The detection depth will also be different under different soil conditions. For example, if the soil is moist or dense, the signal strength of the metal being detected will be weakened and the detection depth of the instrument will be reduced. In addition, the detection depth will also be attenuated when the battery is low and the transmitting power is insufficient. In this case, please replace the battery in time.