OPT-300 Surface Roughness Tester is a high accuracy instrument for measuring sur­face roughness. it can be used on variety of machining parts and operates on various surfaces, not only flat but also outer cone, outer cylinder, curved, pinholes, grooves, recesses grooves and axle ete. The OPT-300 allows surface roughness measurement both on metal and non-metal work-pieces. it is suitable for machining and manufactur­ing, quality control, inspection departments, especially for measurement on large and heavy work-piece, assembly line, on site. The OPT-300 is a Non Destructive Testing instrument, damage won’t caused to testing piece.