Product review (4 stars): A good hygrometer
Good product. I bought this one along with a crane humidifier, this item helped me to maintain RH to comfort zone. Some day my new humidifier could not increase the RH to even 20%. Then I boiled a pan-full of water and saw the RH increased to 45%. Without this I could have under the impression that my new humidifier is doing its job perfectly, which is not the case. I would suggest to but this product if your humidifier does not have auto control/hygrometer display feature.