Working principle & Introduction: 

 It can be used to accumulate and record the rotation times of the shaft machinery and instruments. It has two output axes for testing the positive and negative rotation speed. When the output axis of counter contacts vertically with the rotational parts of the measured objects,  the counter can make the rotation counting. It shows the number directly, it has no reset design. After the reset, the counter can restart to count from 00000. It is mainly applied in the industries such as the textile, machinery, bicycle testing etc.