Went expired and now back.
These normally sell for about $11. These are good to see the humidity in your house which should be about 50% to prevent mold growth so you know if you need a dehumidifier or a humidifier usually in the winter to keep you and your house from drying out too much. These also help your house to last longer if you keep the humidity about 50%.
Also sells at amazon for same price, but I like walmart better with their returns and store presence.
https://www.walmart.com/ip/seort/16888914
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