3M 26120, PPS Series 2.0 Adapter, Type S28, 17.5 mm Female, 19 TPI
Thread, 7100135956 
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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