Is it a good idea to use screen protectors on my new Apple Watch to protect against scratches on the crystal?

You do not need a screen protector for your Apple Watch. I had the original Apple Watch, and got the series 4 last year. I wear my watch everyday and it has never scratched. Unless you think you are going to fall down on your wrist a lot (jk), don’t worry about the screen, it’s really tough!

Depends on the usage of the Watch and how careful you are. If you are going to use it digging into the ground while gardening you might need one.

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I have the same question, and if it is recommended, are there any recommended or tried and trusted brands to suggest Thanks!

I have a friend with a Zagg and they like it. There is no Apple commendation or trusted brands to suggest.