High precision and high performance type surface roughness tester with a dedicated control unit, achieving user-friendly display and simple operation. User-friendly display and simple operation equipped with a highly visible color 7.5-inch TFT LCD. Easy positioning A joy stick built in the dedicated control unit allows easy and quick positioning. Fine positioning of a small stylus, required for measuring the inner side of a small hole, can be easily made using the manual knob. Easy setting of measuring conditions for surface roughness. Equipped with simple input function allows inputs according to drawing instruction symbols of ISO/JIS roughness standards. Troublesome measuring condition settings can be easily input by directly selecting a drawing instruction symbol for surface roughness from the menu.