These 6-in Sorby calipers measure not only wall thickness but inside dimensions like the size of an aperture: as with double ended calipers, the measurement at one end automatically transfers to the other, outside reading inside.
Specifications:
- Size: 6 in (an 8-1/2-in model is also made)
- Functions: wall thickness and inside dimensions; the measurement at one end transfers to the other
- Made in: Sheffield, England by Robert Sorby