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Precision instruments used to determine particle size and fineness of grind of many materials but speficially printing inks.

The NPIRI gauge and its scraper are made of hardened stainless steel. The gauge has two grooves with a gentle slope.

The NPIRI scale is displayed alongside the microns scale.

Test method:

How to use a Fineness of Grind Gauge

The material is placed on the lowest (deepest) part of the groove, and using the scraper provided, drawn up the slope in the opposite direction.

The place where a large number of particles appears indicates the particle size.