Review on Rojuna Hygrometer Thermometer Humidifiers Greenhouse by Kevin Singh

It is not possible to verify the validity or accuracy of these small hygrometers with a second calibrated instrument, but I will say that after leaving them in static conditions for 1 hour, all within displayed were +/- 1 of each other in temperature and humidity. If they're wrong, then at least they're wrong all the time, which seems good to me, and they should work fine, at least for now. And if not, they were cheap enough that replacing them wasn't much of a problem.