Taking the measurement
At any time, do not touch the measuring surface of both the micrometer and the item with your hands, because the sweat on your hands will cause inaccuracy to the measurement. You have to keep them dry and clean all the time.
Step1: Carefully open the jaws of the digital outside micrometer by revolving the ratchet.
Step2: Slightly place the item to be measured against the anvil of the digital micrometer. Make sure the micrometer is perpendicular to the surfaces being measured.
Step3: Rotate the ratchet stop until the spindle contacts the item. Do not clamp the micrometer tightly on to the workpiece. Use only enough pressure on the ratchet stop to allow the item to just fit between the anvil and spindle. Generally speaking, you can revolve the ratchet stop for three circles slightly when the spindle contacts the item.
Step4: Lock the lock nut on the digital outside micrometer to make sure that the figures can not change any more.