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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