Dynabrade 51702 .1 hp Straight-Line Pencil Grinder, Rear Exhaust, 60,000 RPM, 3/32" Collet 
Insize 2234-4, THREAD PITCH MEASURING INSTRUMENT, 12.7-101.6mm/.5-4″, 6928640384608
$1,958.59
Dial indicator graduation 0.01mm
Accuracy 0.02mm
Measure the pitch of external thread and inter thread with nominal diameter larger than 5 1/2″(139.7mm)
Optional accessory: ball points, standard pitch blocks
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