Mechanical dial calipers and electronic digital calipers can have similar high precision and accuracy. Depending on the model, both types can reach 0.01mm or 0.0005 inch resolution (precision), with 0.02mm or 0.001 inch accuracy. The difference between the two types is more a matter of robustness versus ease of use.
Prices are also about the same. They start as low as $20 and can reach over $100 for premium brands. Popular brands include Starrett, Mitutoyo, Neiko, Avenger, Fowler and Wixey. Most common are 6 inch models but 4 inch, 8 inch, 12 inch and other lengths are also available.
Digital calipers have the same mechanical requirements as dial calipers:
- Measuring edges should be straight and meet precisely without any visible gaps.
- The rail should be straight and the jaws should slide smoothly without being loose.
- A thumb roller fine adjustment allows precise closing of the jaws.
- A locking screw stops the jaws from moving.
Measuring edges and bars to support the following measurements are standard:
