Since there were two devices in the box, I wanted to check how accurate (or at least consistent) they are. I put them side by side on the table away from drafts, cold and heat. Temperature quickly stabilized at about the same for both, but humidity was 17% for one and 43% for the other. He hasn't changed much overnight. Our other hygrometers showed about 30% relative humidity. And one of the little magnets fell right out of the box. And the battery cover is difficult to open. And they use a disc battery, not regular AAA. Overall not a very good product.
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