Surface Roughness Tester Drive Unit Profile Ra Ry Rz Rt Rp Rq Rv Rsk Rku Rc RSm S RPc R3z Analysis Graph Bearing Area Curve Amplitude Distribution Curve Dimensions (in) 6.85 W x 2.59 D x 2 H Power Supply Ni-MH Battery AC Adapter Paper Type Thermal Paper Width (in) 2.28 in For Use With Mfr No 178-563-01A 178-563-02A 173-573-01A 178-573-02A