Pocket-sized economically priced, completely portable instrument which performs traceable surface roughness measurements on a wide variety of surfaces; can be used confidently in production, on the shop floor and in the laboratory. Can be used to measure any one of four, switch-selectable, parameters: Ra, Rmax/Ry, Rz. Out-of-range (high or low) and “battery low“ signals are also displayed. our switchable probe positions – axial (folded) or at 90°, 180° or 270°.