I wear eye protection and ear muffs 100% of the time when using the angle grinder. I've tried to consistently use a face shield, but it quickly ends up just collecting dust on my pegboard. I will try to remind myself to use it again.
Last I bought was that Uvex Bionic face shield from Amazon. It is highly rated. I certainly liked it more that the typical 3M version from the big box stores.
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In my tool arsenal, the angle grinder, table saw and chainsaw are those tools I highly give respect to.