Large, whole pieces of sandpaper are easy to identify. How do identify what grit it is when there is no grit number on the back?
The reason I ask is that I purchased an assortment of sanding pads for my Multimaster and some of the pads have no number. They also were unsorted.
BPR
Sandpaper grit ID
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michaeltoc
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Separate the grains from the paper and measure the size in microns. 
But seriously, compare the sheets by look and feel with a known grit. It may not be precise, but you will get close enough.
But seriously, compare the sheets by look and feel with a known grit. It may not be precise, but you will get close enough.
Michael
Mark V Model 500 (1985) upgraded to 520 (2009) and PowerPro (2011); Bandsaw, Jointer, Jigsaw, Planer.
Mark V Model 500 (1985) upgraded to 520 (2009) and PowerPro (2011); Bandsaw, Jointer, Jigsaw, Planer.