... life:>100,000 times 3.Simple installation 4.Widely Use Water Flow Sensor SZ3681.Low cost 2.Electrical life:>100,000 times ... Use Movement explaination:When the float ball rises or falls with the liquid to the level of the switch, The ... the polluted water, it occupies the advantages for automatic ajustment, easy operation, simple installation, safe performance, no need maintaince and enviromental ...