1.  Hardened stainless steel main scale and measuring jaws.
2.  Zero-setting at any position
3.  mm/inch measurement system conversion
4.  waterproof IP54
5.  3V environmental battery,battery life>1 year
6.  Direct measurement center distance between holed(Φ>1),by adjusting the height of left measuring bar and
moving the caliper frame
7.  Measurement for distance between plane and hole center


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