Settled. Masks are not OSHA approved.
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Not settled. For this to be true it would mean any mask is always unsafe. I think the meter is not designed to respond quickly to the changes from inhaling/exhaling.
Here's a study that measured peripheral oxygen saturation levels before, during, and after wearing a mask. See Table 2. https://jamanetwork.com/journals/jama/fullarticle/2772655
Theres plenty of reasons not to like masks. But this video is not one of them.