It can be used as digital frequency counter in less than 250 Tons Punches, Bending machinery and Shearing machinery. It also can be used as digital frequency counter of Adjustable sliders, Machinerys travel, and Numerical Closed Heights. The bi-directional control scale is 0-999mm. The instruments alarm will also go off when the load exceeds the allowable minimum and maximum rates, which are accurate, timely and reliable. The scale increases or decreases by 0.1mm when the shaft completes one cycle. Its rotating speed is also 800 turns/min.