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https://www.amazon.com/dp/B087313N8F/
I can't find the 4 pack deal anymore, but a quick search shows this 6 pack for $27: https://www.ebay.com/itm/124589066080
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I got this a week ago for my humidor and will return for this reason. It does not sync automatically, and the fact that I have to go into the app, press sync and wait 30 seconds for each one ruins it.
There is a widget on Android but the refresh button does nothing so again, you have to go into the app.
Also, the range is poor. With a wooden box around it and nothing else range is 20 feet. I have another cheap Bluetooth hygrometer and it syncs much further (and automatically).
On the plus it seems accurate.