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Owned my series 4 stainless steel for 3 years and not a single mark on the screen, even under intense light. Just throwing my opinion in but unless you have the aluminium version then screen protectors are pointless.
 
S5 titanium and no scratches on the screen. ^ what the other poster said u less your aluminum I wouldn’t worry about the screen. And I garden and work outside the house with my watch.
 
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