3M 65487, Pro Grade Precision Ultra Durable Universal Hole Sanding Disc, DUH560TRI-10T, 5 IN x UH, 60, 7100202913, 10 per pack 
Insize 1155-505, DIGITAL HIGH PRECISION HEIGHT GAUGES, 0-2″, 6940561937237
$4,238.81
Resolution .00002″/.5um (can switch to .00005″/1um)
Power supply: 5V/1A (adapter or chrge pal)
High stability, high precision, high response speed(200″/s)
High brightness LED display
Ceramic base flatness:1_m
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