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CES 2021: Smart Masks, Smart Air Purifiers and More Covid-Fighting Gadgets

At this year's virtual tech megashow, gadgets to protect you from Covid-19 are all the rage. But do you need a connected mask and a personal air purifier? What about a doorbell that takes your temperature? WSJ's Joanna Stern checks out this new gear—from her basement. Photo illustration: Preston Jessee for The Wall Street Journal