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the products go through as following professional test:
1. Mechanical test to ensure the toners smooth operation and no noise
2. Environment protection test to ensure toners' environmental safe.
3. Duration test to ensure toners can last more one year.
4. Difficult conditions tests such as abnormal temperature, air pressure, strong sun light and rough transportations tests to ensure the printing quality remains high.
5. Water resistant test to ensure printing won't fade and be diluted when wet.
6. Printing quality test to ensure the printing is real black, sharp, no slur and won't fade.
7. Capacity test to ensure the number of printed pages is the same as the ones of original manufacturers.