Rubert - Surface Roughness Comparator can be used to measure or verify the manufactured surface finish or roughness of a part and/or assembly. Surface Roughness Comparator is used in cases where surface roughness needs to be measured with great precision. Surface Roughness Comparator is an elaborate instrument used where machined surfaces' roughness can usually be assessed conveniently and with sufficient reliability using visual and tactile (fingernail) comparison with a standard set of surfaces machined in the same way. These products are simple to use, inexpensive, and hence widely used in many different applications. The golden rule to follow is to use comparison specimens, which the same process has machined as the workpiece being checked. Rubert’s most popular set consists of 30 comparison specimens, covering six of the most commonly-used machining methods. Product Specifications Brand: Rubert Colour: Silver Dimensions: 5x3x1 cm Material: Stainless Steel Product: Surface Roughness Comparator