Product review (4 stars): Nice, affordable hydrometer
Put batteries in these bad boys today. Admittedly, because of the price, my expectations were anchored kind of low. All three units worked out of the box and all three range from 47% - 48%. Since I don't own a high end humidity monitor (hydrometer), I cannot attest to their accuracy, although they are within 3% of other hydrometers here. I can attest to consistency (all three within 2% of eachother). They seem to be built solid, look nice (not cheap) and have magnets on the back for flush mounting.