Hardware tools can not be less

A set of good hardware tools, in addition to proper use, use a lot, the maintenance can not be ignored.

To maintain the micrometer, the following 8 points are indispensable: 1. Check that the zero line is accurate; 2. The workpiece must be wiped clean when measuring; 3. When the workpiece is large, it should be measured on a V-shaped iron or flat plate; Clean the measuring rod and anvil before measurement. 5. Use a ratchet device when tightening the movable sleeve. 6. Do not loosen the back cover to prevent the zero line from changing. 7. Do not place between the fixed sleeve and the movable sleeve. Add ordinary oil; 8. After use, wipe oil, put it into a special box, and put it in a dry place.