24-Pack Mini Digital Hygrometer Thermometers — Indoor Temperature & Humidity Gauge (Fahrenheit) for Greenhouse, Garden, Cellar, Closet

Compact 2-in-1 hygrometer set: includes 24 black mini digital hygrometers with a built-in sensor to measure both indoor temperature and relative humidity, giving a clear picture of your environment. The easy-to-read LCD displays temperature in Fahrenheit for fast monitoring. Measurement ranges: temperature -58 °F-230°F and humidity 10%-99%RH. Power and activation: each unit is supplied with 2 LR44 button batteries; the battery compartment contains an insulating tab that must be removed to turn the device on. Installation options: designed to fit an embedded opening of about 1.81 x 1.06 inches, or mount with double-sided tape if that size doesn’t match your installation. Ideal uses: suitable for greenhouses, gardens, guitar cases, incubators, brooders, office spaces, basements, refrigerators and closets where temperature and humidity control is important.