1. Watch if the bakelite handle surface is shiny and burr-free.
2. Whether the screws and nesting of the handle are of sufficient grade, accuracy and rust prevention process are passed.
3. Whether the overall measuring handle is processed according to the industry standard of the mechanical department.
4. The screw and thread nesting of the handle are pre-buried in the bakelite handle. It is best to do a destructive experiment, the firmness of the metal part and the bakelite handle part.
