For $30, this better be one of the best screen protectors we've used. Intevac's patented DiamondClad carbon coating will supposedly lead to a tougher and longer-lasting screen protector than other generic tempered glass options.
https://www.notebookcheck.net/Diamond-Dog-screen-protector-promises-to-be-6x-harder-to-scratch-than-typical-9H-tempered-glass-solutions-costs-almost-twice-as-much.484873.0.html