Gardco :: Stainless Steel Fineness of Grind Gauges
Most grind gauges will have one scale marked in either mils or microns. 1 mil = 25.4 microns 1 mil = 0.001 inch 1 micron, µm - 0.001 mm or 10-6 m The Hegman scale of National Standard scale may be abbreviated "NS" on the gauge. The scale ranges from 0 to 8 with numbers increasing as the particle size decreases.
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