Insize 2235-4, INTERNAL THREAD PITCH MEASURING INSTRUMENT, 12.7-101.6mm/.5-4″, 6928640384615

Dial indicator graduation 0.01mm
Accuracy 0.02mm
Measure the pitch of internal thread with nominal diameter larger than 1 1/2″(38.1mm) and less than 5 1/2″(139.7mm)
Optional accessory: ball points, standard pitch blocks