Handheld Surface Roughness Tester Features Automatic Probe Leveling Measuring Range 0 micron in to 3937 micron in 1.97 micron in to 15748 micron in Profile Ra Rq Rt Rz Rc Rmax Rsm Rpc Rmr R Ar Rx Analysis Graph Profile and Curve Cut Off Length (In.) 0.01 in 0.03 in 0.1 in Sampling Length (In.) 0.63 in Number of Sampling Spans 1 2 3 4 5 Arbitrary Length (In.) 4.800 Dimensions (In.) 4.80 x 2.05 x 2.68 Output USB Cable Software Power Supply 9V Battery