It has high reliability, no pollution, stable performance, no contact with industrial media can meet most of the liquid level, material level measurement requirements.Completely solve the pressure type, capacitance type, float type of traditional measurement methods such as winding, jam, leaking, corrosion medium, safeguard the disadvantages such as inconvenience, thus can be widely used in water and sewage pump room, collecting well, biochemical reaction tank, tank and so on electric power, coal mine slurry pool, the slurry pool, butter, tanks, stocking yard or part of a mobile device control wineries, food industry, grain and food materials containing tank control system.