JL645 counter is a general-purpose 5 digit stroke-type mechanical counter, used to accumulate and record the number of mechanical reciprocating movements, without zero return mechanism. When the record is full of 99999 and then from 00000 to start the next cycle of counting. The counting wheel of the counter is internal gear drive. When pulling the counter arm, and the arm connected to the propulsion mechanism to make the counting wheel for addition counting. This kind of counter is mainly used in the industries of switch and electric appliance, experimental equipment and printing equipment, sealing machine, etc.