A temperature and humidity meter, also known as a thermo-hygrometer, is a device used to measure the air temperature and the amount of moisture (humidity) in the environment. It provides accurate readings that help monitor and control indoor or outdoor conditions.

This type of meter is commonly used in hydroponics, greenhouses, grow rooms, homes, and storage areas. In plant-growing environments, maintaining the right temperature and humidity levels is essential for healthy growth. Proper conditions help regulate plant processes like transpiration and nutrient uptake, while preventing problems such as mold, mildew, or heat stress.

The device typically uses built-in sensors to detect temperature (usually displayed in °C or °F) and relative humidity (shown as a percentage). Many modern meters have digital displays and may include additional features like memory, alarms, or min/max readings.

Overall, a temperature and humidity meter is a valuable tool for creating a stable environment, ensuring plants grow efficiently and remain healthy.