The *Hair Hygrometers* are the worst. They work, kinda, when new, but the hair gets contaminated and they gradually deteriorate.
I was gonna get a Flukers .... in the end the Amprobe came up and it does well.
I have 2.
An Amprobe THWD-2, which retails at $115 but I bought new, on Ebay, for $30. It is guaranteed accurate to 3%RH over the range.
A Sprinfield PrecisionTemp, which I bought for $6 at Walmart. It won't register lower than 20%RH, but other than that is usually within about 2% of the Amprobe.