How to test the quality of condoms?

Condoms are made of natural rubber and must pass electronic pinhole test, water leakage test, bursting pressure test and aging test. As a salesperson who does not have professional instruments for testing, you can use the following methods to assist the inspection:

A. Inflating method: high-quality condoms, after blowing, expand evenly with the pouch as the midpoint; Blow it to 30cm, and the nipple shape can be maintained at the front end.

B. Stretching method: unfold the condom and stretch it repeatedly in vertical and horizontal directions, so that the high-quality condom will not tear.