Notes to be observed：

1. scope of application：For scientific research purposes only, not for clinical testing.   
2. Packaging inspection：Confirm that the packaging is intact and within its validity period (3 years)
    before use. Do not use if it is damaged or expired.  
3. Operating specifications：  
   - Avoid sharp objects from contacting the filter screen to prevent damage.  
   - Do not reuse and dispose of in a biological recycling bin after use.  
4. Storage conditions：  
   - Environmental humidity ≤ 80%, ventilation without corrosive gases, avoid direct sunlight.

Product performance indicators：

1. appearance：Uniform color, without deformation, scratches, oil stains or mold.   
2. structure：The filter screen is firmly welded, with a smooth surface and neat cutting without burrs.  
3. aseptic：After irradiation sterilization, there is no DNA/RNA enzyme contamination.   
4. dimensional accuracy：Meets the requirements of the drawing, with an error of ≤ ± 0.5mm
    between the diameter and the total height.