Surface roughness meters are used to accurately measure the peak to surface roughness of sandblasted or shot blasted surfaces. The average value of a series of measurements is the surface roughness of the measured surface. Allows comparison of surfaces during spraying. In addition to evaluating the roughness of sandblasted or shot blasted surfaces, the instrument can also be used to test the depth of pits and grooves caused by corrosion. The instrument has an accuracy of up to 1um. Available in Metric and Imperial systems. Implementation standards: ASTM D4417 and SANS 5772