Quote Originally Posted by kitedemon View Post
Hair hygrometers do not have evenly spaced scales the RH scale starts widely spaced and then gets narrower. It is related to how much hair moves in various humidity. Look at the face

http://www.robertwhite.com/cgi-local...av_bar=weather

10% to 20% has a very large space where 80 to 90% is quite small. This is the mark of a true hair hygrometer. They quite literarily have a strand of hair inside. They are very consistent.

so which out of the 3 you have showed me the UK ones would you recommened most?