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Digital calipers display measurements directly. These basics help you get repeatable results.
Last updated: October 31, 2026.
Zero the Caliper
Close the jaws fully and press zero. See best digital calipers.
Outside, Inside and Depth
Use the large jaws for outside, the small jaws for inside and the depth rod for depth.
Inch and mm
Use the unit button to switch. Gently close the jaws; too much force changes the reading.
Care
Keep the jaws clean and store the caliper closed.
Frequently Asked Questions
Are calipers accurate?
Within their spec when used correctly.
Why does it drift?
Dirt or low battery.
Inch to mm?
Press the unit button.
Bottom Line
Zero it, use light pressure and keep it clean.
