That's good information to keep. Thanks mondotomhead.I used the walmart Acu-right also. You can calibrate this:
Get a coffee cup and put 1/2 cup of table salt in it
Add to the salt in the cup 1/4 cup of water
Put the cup and hygrometer into a plastic bag, a big one. Not a sandwich bag. Seal tightly.
Wait approximately 8-12 hours
The humidity measurement should read 75
If it doesn't adjust appropriately. Mine was 3 degrees off
