1. designed for internal and external diameter, depth and step measuring.
2. come with a plastic protection case to restore it.
3. clear and large lcd screen display a clear and easy-to-read measuring result for you, with an easy-to-switch button between inch and mm.
4. extra accurate: 0 - 4 inch / 0 - 100mm; resolution: 0.01 inch / 0.1mm; accuracy: +/- 0.2mm/0.01 inch. test and calibrated to reach extreme accuracy in manufacture