1. see light transmittance
Good quality car film has good light transmittance, and you can see objects 5 meters away when driving at night, while poor quality film has poor light transmission performance, and you can basically only see objects within 5 meters when driving at night.
2. to touch by hand
Everyone remembers that high-quality car film feels smooth and thick, while inferior film feels not only thin and brittle, but also very easy to wrinkle.
3. Scrape with your fingertips
When you start to check the car film, you can scrape the inside of the car film with your fingernail. If you find that the color falls off, don't buy such a film, there is no doubt that the inferior car film is.