Question about Amazfit T-Rex 3

No, I don't need a protective film and I don't have a scratch on the glass

I don't have a protective film for the T-Rex 3 because it's made of Gorilla Glass. The glass is also protected by the slightly raised bezel.

Never checked it, I bought the watch to gift it to someone. But I am sure you can find the protective film. Its a great watch and beautiful.