I bought these really wanted an old school temp/humidity reader that didn't require batteries but was very disappointed with the quality. The first thing I noticed was that the measurements on the two readers were different. when I first got them. I did a saline suspension test to get them set up properly, but unfortunately after a few days I found that readers are still reading differently. I adjusted them a second time just to cross-check the readings with my digital device and after more than 24 years side by side they still don't match 5-10% humidity. Sometimes they were 20% cheaper than the others. Thank you for the right of return under these circumstances. Don't waste money.
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