This precision instrument is used to determine particle size and fineness of grind for many materials including paints, pigments, inks, coatings, chocolates and other similar products.
The gauge and its scraper are made of hardened stainless steel and are graduated in microns on the top to an accuracy of ±1µm (0.04mil). The groove width is 12mm (0.47") and the groove length is 200mm (7.87").
The high precision Grindometer has a single groove.
For an instructional video,
copy and paste this link: https://www.youtube.com/watch?v=kA4-srdjGFQ