Easy and accurate way to measure the conformal coating dry thickness

Important things to consider before measuring the conformal coating dry thickness. Follow these steps to get an easy and accurate way to measure the conformal coating dry thickness.
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Section 1: Use an uncoated area to measure the solder mask as reference point (zero microns)
Section 2: Measure the thickness in 4 corners plus the middle, then take the average
Section 3: Micrometer thickness measurement
Section 4: Use an uncoated area to measure the solder mask as reference point (zero microns)
Section 5: Coating thickness measurement is limited to the perimetral of the assembly

[@RyanHowe-b2r]

What measurement device was used here? I'd love to buy one