I'm changing my rating to 1 star. I've since ordered a few more of these and received a full DUD that was far from a temp and humidity percentage. I tried to return or exchange it and was told it was not possible. It's a shame. The rest worked well within -1 + 1 degrees and humidity percentage. I had them all lined up and in the same place for 4 days and only 1 was gone. I even replaced the battery with a new Duracell. I tried to exchange it but they told me I couldn't do it. So now I'm stuck needing to mark the difference and it's just annoying. Bad customer service. These monitors are fantastic. I bought 3 and the difference between the readings is very small. I have them all over the house and they can also be attached to metal if needed. I have one in the garage, living room, bedroom and my office. I used to have a humidity problem in my house and this really helps me to keep the levels under control.
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