Grind Gauges & Physical Test Equipment

Fineness of Grind Gauge

Grind Gauge or Hegman Gauge

The fineness of grind gauge is an easy to use, relatively inexpensive production and quality control instrument that enables the manufacturer to check for unwanted agglomerates as well as particles that are too large. Grind gauges and scrapers are consumable products and need to be refinished or replaced when they show visible damage to the gauging surface or readings become suspect.

Hegman, micron, mils and NPIRI are common scales on fineness of grind gauges, wedge plates and printing plates. P.C. scale or the N.S. scale (In 1968 PG&T changed N.S. to H for Hegman) are sometimes used on older gauges.

Long form certification is available at an additional cost for grind gauges and scrapers but is almost always included FREE when you purchase your gauge online through our website.

Precision Gage & Tool Co has created thousands of custom grind gauges since 1932 for customers in various industries. Please contact PG&T and we will be glad to assist you in determining which type of gauge is best for you.

Gauges by Industry

Precision Gage & Tool Co. adapted gauges for use in the ink (ASTM D-1316) and other coatings industries. Other industries such as the food, cosmetic, pharmaceutical, nano material, adhesive, petroleum, battery and other slurry products now also use the fineness of grind gauges in many areas of manufacturing from quality control and research and development applications to on the floor and in process testing.

We also offers a variety of other physical test equipment items that include but are not limited to wet film applicators and cross cut adhesion test kits.  For a more extensive product listing download our grind gauge catalog or contact us.

Check out this basic grind gauge chart showing the specifications and a description of the typical application for each type of gauge and applicator.

Scale and Units of Measurement

Mils – The equivalent of .001 inches, the Mils Scale is the most widely used unit of measurement regarding fineness of grind gauging equipment.

Microns – For a point of reference, 25 Microns is equal to 1 Mil. The commonly used Micron is usually rounded to .00004 inches for practical purposes of grind gauge measurement.

NPIRI Scale – Designed for the ink grind gauge, the NPIRI Scale was developed by the National Printing Ink Research Institute. The NPIRI scale begins at 0 (zero) and extends to 10 at the point of depth equal to .001 inches. Although somewhat arbitrary, this grind gauge scale is logical in that each division is equal to one tenth of a mil or 2.5 microns.