How to take inside measurements using a digital caliper

Step 1 – Zero caliper then insert upper jaws in hole

Close the jaws completely so that the caliper reads zero. Insert the upper jaws into the hole you are measuring.

Step 2 – Use thumb screw to open internal jaws

Open the internal jaws using the thumb screw, until the outside of each jaw touches the circumference of the hole.

Step 3 – Turn lock screw

Turn the lock screw to tighten the jaws so that you can remove your object and take your reading from your digital caliper.

Step 4 – Read measured value

Read the measured value from the LCD display.