Should the gauge measuring surface and parts of the surface is measured to clean 1 before measuring, so as to avoid dirt exists affect measurement accuracy. Using precision measuring tools to measure the forging and casting blank, or surface with grinding agent is wrong, so easy to make soon wear and lose face measurement accuracy.

2 gauges in use process, don't and tools, tools such as files, tools and drills piling up together, avoid bruising measuring tool. Do not put on the machine, for machine tools and free vibration measuring fall damage. After use should be placed in a special box, avoid that the ruler body deformation.

3 gauge is a measuring tool, can not be as other tools such as caliper substitute. With marking with ruler, clean up scraps is wrong.

4 temperature have great influence on the measurement results, the precision measurement of parts must make parts and gauges are measured at 20 degrees Celsius. The general case can be measured at room temperature, but must make the workpiece and measuring temperature is the same. Otherwise, the characteristics of metal material of the thermal expansion and contraction, so that the results of the measurement.

5 don't gauge placed in a magnetic field nearby, such as magnetic worktable and grinding set, in order to avoid measuring magnetic induction.

6 found quantity has the abnormal phenomenon, such as uneven surface, a burr, a rust and scale are not allowed, the bending deformation of the ruler body, activities are not flexible and so on, the user can't dismantle and repair, in order to avoid increases measuring error.

7 the use of measuring tools, should be promptly wiped clean, in addition to stainless steel gauge or protective coating, metal surface should be coated with a layer of anti rust oil, placed in a special box, stored in a dry place, lest they should rust.

8 precision measuring tools should carry out regular verification. So as to avoid gauge shown value error caused by product quality accident.