25/50/75/100mm 0.001mm 4-piece Set, Outside Micrometer, Spiral Micrometer

If the zero error is less than 0.01mm (o.001") (within the engraved line of the microtube), use the stop device to lock the screw rod, and use the wrench to move the fixed sleeve until the zero line is aligned. Method Two For zero error greater than 0.01mm (0.001") (above the micrometer tube marking line) Step 1: Use a stop device to lock the screw rod, use a wrench to loosen the force measuring device, and remove the micrometer tube. Step 1: Realign the zero mark on the fixed sleeve and the microtube and install the force measuring device. If necessary, use method one to reset to zero. Special attention: This is when the micrometer is severely worn and needs to be adjusted. Do not adjust it in normal use.