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Ferrous metals mainly refer to iron, manganese, chromium and their alloys, such as steel, pig iron, ferroalloys and cast iron.
Metals other than ferrous metals are called non-ferrous metals, such as gold, silver and copper.
Please note: the detection depth is mainly based on the size of the area of the metal to decide, the larger the depth of the metal area the deeper, the smaller the shallower. Instead of the machine labeled a few meters is the size of any thing can be detected a few meters! For example, a coin, silver dollar, etc. want to detect a few meters, that is impossible Oh! Imagine if this who still need to go to work? The depth of detection is also closely related to the local geomagnetic field, the degree of oxidation of the object (years of burial), the geographic environment and soil structure, the variety of minerals and the physical depth, size, and commissioning of the user.
Underground due to the moisture density of the soil as well as other factors, such as soil moisture and density, signal penetration is poor, detection is shallow, moisture and density is small, signal penetration is strong, detection is deep, so we do not do similar tests.
Recognition function is to allow the machine to shield unwanted signals, only to be artificially shielded off, will make the sensitivity reduced. Therefore the actual use in order to avoid missing what you want to look for, it is not recommended to use the function, for the area of large metal signal is particularly strong, according to the principle of signal shielding, the machine is no way to completely shield.
Debugging should be in the outdoors, surrounded by no metal place, because if there is metal, it will produce interference, debugging error machine will be chaotic this is a normal phenomenon.
