I have owned this meter for 2 years now. I bought this device with my humidifier. I always want to know what my humidity is doing. Below 30% I start getting electrocuted by anything metallic in my house, my breathing gets worse and it's harder to sleep. 40% is really the optimal value as I don't experience shock, breathe easily and sleep soundly. But you don't want the humidity in your house to rise above 50%, then it will get too humid and you start sweating, or it can cause electrical damage…