Chain accuracy should be measured according to the following requirements:

1. The chain is cleaned before measurement
2. Wrap the chain to be tested on the two sprockets, and the upper and lower sides of the chain to be tested should be supported
3. The chain before the measurement should stay for 1 min under the state of applying one-third of the minimum ultimate tensile load
4. When measuring, apply the specified measurement load on the chain to make the upper and lower chains tensioned. The chain and the sprocket should ensure normal meshing
5. Measure the center distance between two sprockets