The Elcometer 2020 fineness of grind gauges are instruments used to determine the particle size and fineness of grind of many materials including paints, pigments, inks, coatings, chocolates and other similar products.
These two channel gauges, together with the scrapers, are made of hardened stainless steel and have two grooves with a graded slope (dependent on the model chosen). Graduated in microns, mils, NS (Hegman) or PCU (North), the gauges have a tolerance of ±2µm (0.08mil). The groove width for all models is 12mm (0.47") with a groove length of 127mm (5.0").
Elcometer 2020: The standard gauge shows graduations in microns or mils, NS and PCU which are all engraved on the top of the gauge.
For an instructional video,
copy and paste this link: https://www.youtube.com/watch?v=kA4-srdjGFQ