This device demonstrates a rare quality in fashion - repeatability. Not very accurate. I received a batch of hard maple and aged it for a week after being placed in a controlled environment. I ran a series of measurements and they corresponded to 13-16% humidity. The seller promised 6-8%, which is exactly what my friend with a professional counter prescribed. So my instrument is only good after I calibrate it to his. If this is going to be your only counter and you are making a decision based on the data, get a higher quality one.
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