Insize 2235-4E, INTERNAL THREAD PITCH MEASURING INSTRUMENT, 0.5-4″/12.7-101.6mm, 6928640384639

Dial indicator graduation .0005″
Accuracy .0008″
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