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How to use a caliper
type inside micrometer

Shop for Micrometers

Step 1 Turn the ratchet speeder until the micrometer reads zero.

Step 1 – Adjust micrometer

Turn the ratchet speeder until the micrometer reads the lowest value of its range. Because of the design of the jaws, caliper micrometers typically start with a range of 5 to 30mm.

Step 2 Insert the measuring faces into the hole you are measuring.

Step 2 – Insert micrometer into hole

Carefully insert the measuring faces into the hole or aperture you are measuring.

Step 3 Rotate the thimble using the ratchet speeder until the measuring faces of the micrometer make contact with the edges of the space being measured. Pivot the micrometer to ensure that it is as horizontal as possible. Do not use excessive force; light but firm pressure ensures accurate measurements.

Step 3 – Rotate thimble

Rotate the thimble using the ratchet speeder until the measuring faces of the micrometer are near the surfaces to be measured.

Carefully continue rotating the ratchet until contact is made and the spindle no longer rotates. The ratchet will keep turning, applying the correct amount of force for an accurate measurement.

Step 4 Turn the lock nut to secure the distance between the measuring faces then remove the micrometer. Step 5 Read the measured value (See How to Read a Micrometer).

Step 4 – Lock spindle

Turn the lock nut or lever to secure the distance between the measuring faces then remove the micrometer if required.

Step 5 – Read measured value

Read the measured value (see How to read a micrometer).

Wonkee Donkee says: 'When taking measurements, try not to touch the measuring faces of the micrometer. Even the smallest amount of oil on your hands can affect the accuracy of your readings.'

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