Insize 2237-5E, INTERNAL THREAD CREST DIAMETER MEASURING INSTRUMENT, 2 3/8″-5 1/2″/60.325-139.7mm, 6928640384691

Dial indicator graduation .0005″
Accuracy .0008″
Measure the crest diameter of internal thread with nominal diameter larger than 2 3/8″(60.325mm) and less than 20″ (508mm)
Optional accessory: height standard and zero standard block