external diameter continuous measuring instrument

1、Application
To precision measure circular degree and OD of round object.
2、Operatiions
1)let measured object can contact with the two idler wheels of centering stents and the fixed head(Chart).
2) Push sliding screw, let measured object can contact it (Chart).
3) Locked the screw lock nut.
4) Tightening spring nut, ensure to clamp the measured object.
5)  Rotating 180,ensure the diameter of measured object is accurate measured by the continuous

Minimum measuring range: 20mm