Suitable for level control tanks, vessels, boiler drums, can be used to get audio / visual alarm to operate valves pump. It consist of a fixed stem to which a cylindrical float is hinged & the float up & down along the liquid level. A permanent magnet hosed in the float actuates & de-actuates & hermetically sealed reed switches located in the stem opens as the liquid level rising or to close on falling liquid level depending on the mounting position.