Step1: Dry and clean the measuring surface of the item to be measured with clean cloth (or soaked with cleaning oil);
Step2: Dry and clean the cover of the digital outside micrometer with clean cloth (or soaked with cleaning oil);
Step3: Dry and clean the measuring surface of the anvil of the digital outside micrometer with clean cloth (or soaked with cleaning oil).
Step4: Dry and clean the measuring surface of the spindle of the digital outside micrometer with clean cloth (or soaked with cleaning oil).
Step5: Fully close the digital outside micrometer gently.
Step6: Turn the thimble to make sure the 0 line align with the centre long line on the sleeve completely.
If you use the 25-to-50-mm, 50-to-75-mm or micrometers with larger range, you would need to use the corresponding calibrated rod to calibrate them before measuring. For example, you need to use the 25mm calibrated rod to calibrate the 25-to-50-mm digital outside micrometer.
Step7: Turn on the ON/OFF button of the digital outside micrometer. If it reads 0 and you can begin to take the measurement. If it doesn’t read 0, adjust the thimble and the ratchet stop until it reads o.
Step8: Turn on the mm/in button of the digital outside micrometer and then choose the desired unit system as you like. (Here we choose the mm version.)