1. The thickness difference of the same bottle bottom
Use a thickness gauge to measure the ratio of the thickest point to the thinnest point on the same bottle bottom.
2. Bottle mouth and bottleneck
Use a special pass-through gauge or caliper to measure, and the insertion depth of the bottle neck gauge shall not be less than 35mm.
3. The bottle mouth is tilted
Measured by a height ruler, the difference between the highest value and the lowest value from the bottom of the bottle to the bottle mouth is the tilt of the bottle mouth, that is, the parallelism.