Surface Roughness Tester Drive Unit, Profile Ra, Rc, Ry, Rz, Rq, Rt, Rmax, Rp, Rv, R3z, Rsk, Rku, Rc,RPc, Analysis Graph Bearing Area 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.) 0.98 in, For Use With Mfr. No. 178-561-01A, 178-561-02A, 178-571-01A, 178-571-02A