1)To measure the depth of grooves on the disc brake
2)Manual power on/off
3)Zero setting at any position
4)Metric/Inch system conversion at any position
5)With data output interface
Item No.        Range(mm/in)        Resolution(mm/in)          Accuracy ( mm)
122-305             0-75/3"            0.01/0.0005'"              +/-0.03
122-310            0-100/4"            0.01/0.0005'"              +/-0.03
122-320            0-150/6"            0.01/0.0005'"              +/-0.04