Digital temperature and humidity sensor Monitor temperature, humidity, heat index (feels like temperature) with AVTECH's Digital Temperature & Humidity Sensor. This sensor provides real-time temperature values from -40 to 185° Fahrenheit or -40 to 85° Celsius when used with any Room Alert environment monitoring device. Temperature accuracy is within +/- 2°C. The humidity range is from 5% to 95% relative humidity (RH) non-condensing. Humidity accuracy is within +/- 4.5%.