1. Silly putty, press the work-piece and stick by hand. Cooperate with paper, feeler to see whether there is a gap.
2. A set of gauge block, correction caliper, used to calibrate when measuring coaxial beating. Cleaned with air-laid paper or alcohol wipe to prevent rust
3. Digital caliper. It is used when cannot confirm whether the measurement is accurate, when can avoid obvious errors
4. Dial indicator, it is used to measure the aperture precision, it can carry out the measurement in many sections and many angles.
5. The magnetic table. It can measure coaxial jumping, etc., and sometimes can adsorb a few small things
6. V block, it is better can adjust the height.