A high precision, high-performance surface roughness tester with a dedicated control unit. The 7.5-inch, colour TFT LCD, large coloured icons and touch-panel controls make the display easy to read and the instrument simple to operate. The built-in joystick on the control unit enables quick and easy positioning and there is a manual adjustment knob to allow fine positioning of a small stylus for positioning, which is useful when testing the inside surface of small holes. Setup is simple with the ISO roughness-standard input function that enables complex setups to be entered easily just by selecting the appropriate symbol from a menu. The instrument can be used stand-alone or mounted on a user-supplied stand.