This instrument can also be used as a digital frequency counter of more than 300 Tons Punches, and in other machines; it is also used as a 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 limits, which are accurate, timely and reliable. The scale increases or decreases by 0.1mm when the shaft completes one cycle. Its rating rotate speed is 800 turns/min.