Product review (5 stars): Accurate and useful
Wanted a hygrometer that was accurate below 40% humidity. There are tons of cheap humidity meters on Amazon and EBAY some selling for $2 or less. They are completely inaccurate in dry weather. I live in a dry part of California and the humidity often drops below 20% and during a Santa Ana wind, can go to 5%. None of the cheap meters can measure dry air humidity, so don't waste your money on them, if you really want to know what is the humidity on a dry day.