Measures the Rotational Ratio of a Roller
"This application monitors tightness and slackness by measuring the rotation ratio between two rollers. ?A Rotary Encoder measures the rotation speed between two rollers in the winding process for materials, such as film, cloth, paper, or cotton. In absolute ratio mode, the K3HB-R Rotary Pulse Indicator converts and displays the rotation ratio between two rollers. You can monitor and control tightness and slackness."