... 4.operation easy 5.3 years warranty Precision Roughness Testing instrument Equipment discription:Precision Roughness Tester is a precision stylus type ... surface roughness measuring instrument, which can plane, inclined plane, cylindrical cylinders, the inner ... Rt, Rmax, D, Rmr etc.Roughness measuring range: Rau 0.01 - 10 μmSample length: L: 0.08, 0.25,u 0 ...