I have four of the little 'hocky puck' hygros that require the app to read. Been solid so far, battery seems to last ~2 years. Always salt tested before putting them in service (or a battery change), new units have been within a point of cal each time.
I have the WiFi version and they have been great. I mentioned in another thread that I have four, but I actually have a fifth one in an outside freezer as well.
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