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How to take inside measurements using a digital caliper

Shop for Digital Calipers
Wonkee Donkee says: 'When taking measurements, try not to touch the measuring faces of the caliper. Even the smallest amount of oil on your hands can affect the accuracy of your readings.'
Inside distances, such as the diameter of a hole, are measured using the upper jaws of the caliper. Inside distances, such as the diameter of a hole, are measured using the upper jaws of the caliper.
Step 1 Close the jaws completely so that the caliper reads zero. Insert the upper jaws into the hole you are measuring. Step 2 Open the internal jaws using the thumb screw, until the outside of each jaw touches the circumference of the hole.

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 the lock screw to tighten the jaws so that you can remove your object and take your reading. Step 4 Read the measured value from the LCD display.

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.