I can't even....lol Wet bulb is such a headache...lol But kuddos to those that have the patience and mindset to deal with those. I'm not dumb, but I hate math....lolI dont know a thing about the salt test. Im an hvac tech. We just use an old sling psychrometer and calculate rh using wet bulb and dry bulb. Fsr as i know its the only 100% accurate way.