Link: Datasheet in PDF | Instruction Manual

This is an easy to use gauge that measures the point-to-valley height of a blast cleaned surface.

The average of a series of measurements provides an indication of the surface roughness and allows the surfaces to be compared as blasting proceeds.

In summary, ASTM D 4417 Method B requires the mean of ten measurements to be calculated at an agreed series of locations, which characterise the surface.

The gauge should be set to zero on a piece of glass prior to the measurements.