1. Large and easy-to-read LCD screen.  
2. Automatic shut-off.  
3. Smooth, brushed all stainless steel, no plastic, glides easily without sticking. 
4. Direct reading for accuracy of 0.001 inch and 0.01mm.
5. Can be set to zero at any position, for differential measurement.  
6. Capable of measuring inside and outside dimensions, step and depth measurements.
7. IP Rating: 67. IP54 calipers are protected from limited dust and protected from water spray with limited ingress protection. IP67 calipers are protected from total dust and from immersion between 15cm and 1 meter in depth.That means IP54 calipers will sustain a little coolant splashing / dust and not break while IP67 will sustain falling in a bath of coolant and sustain more dust ( more sturdy / robust ) and not break.