3M 18352, Scotch-Brite Coating Removal Disc, CR-DH, SiC Extra Coarse, 4 in x NH, 7010328900 
Insize ISO-8000FN, COATING THICKNESS GAGE(HIGH PERCISION), 0~19.6mils/0~59.0mils, 6974029771361
$1,571.17
Resolution .01mils
Can measure thickness of thin costing below .4mils
High repeatability
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