Re: Calibrating Hygrometer
I'm not having much luck with these cheap walmart hygro's either...I took my old hygro (not sure the brand name, purchased a few years ago) and 2 of these walmart $6 jobs and stuck them in a bag to test.
After about 20 hours in the bag the old hygro reads 71% (previous test I did about 2 years ago had the hygro -5%, so this number was right what I expected). But the other 2 walmart hygro's read 63 and 55, they seem to take a lot longer to get an accurate reading.
My old hygro was always about 10-20% higher than the walmart ones, I think I'll leave them in another day to see if I can get close to the 75% mark but if I can't I think I might return them and invest in a better hygro.
|