The All-Metal Flow Meter and Switch is highly designed to provide an excellent quality functionality and performance for very specific purposes. The device is in compliance to the principle of a very popular float-type meter except for the conventional tapering measuring tube. The apparatus is integrated with a cylindrical flow tube and several conical slots around the periphery. It then removes the problems of the cylindrical float inside the tapering measuring glass. The high quality design of the device allows the dirt to be reduced.