Review on 🌡️ Extech 445580: Pocket-Sized Humidity and Temperature Meter with Clip-On Design by Jeff Bundrick

Requires a hygrometer accurate below 40% humidity. Revain and EBAY have tons of cheap moisture meters, some selling for $2 or less. In dry weather they are completely inaccurate. I live in a dry part of California and the humidity often drops below 20% and during the Santa Ana winds it can drop to 5%. None of the cheap meters can measure humidity in dry air, so don't waste your money on this if you really want to know what the humidity level is on a dry day.