Research shows that houseplants flourish when kept within specific temperature and humidity ranges. The GroMeter monitors both temperature and humidity in your home – taking guesswork out of effective plant caretaking. The unique, easy-to-read dial has a thermometer that displays temperature in both Fahrenheit and Celsius on the left scale, and a hygrometer that shows the percentage of relative humidity on the right. Within these two scales are green zones, which indicate the optimal temperature and humidity ranges for healthy plant growth.