Houper HOU-MDT836101 metal detection rocket is important in mining industry in looking for metals. It has many uses. Its system includes an electronic device that can accurately detect metals using electromagnetic waves and special sensors. The working principle of the system is based on measuring the changes of magnetic field created by metals. In the handheld metal detector racket, Ground Balance Controls allow the user to adjust the level of ground effect. The controls usually have several modes allowing the user to change the sensitivity to ground signals. Disc Control allows the user to distinguish various types of metals from each other. By adjusting the control, the user can select the metals they are looking for, and exclude other metals.