The SHT40-AD1B-R2 with Board Mount Humidity Sensors RH T Sensor is a humidity and temperature sensor manufactured by Sensirion. It features a high-accuracy digital I2C interface and is designed to measure relative humidity levels from 0 to 100 %RH. It also has a temperature range of -40 to +85°C. The SHT40-AD1B-R2 is well-suited for a range of applications including home automation, HVAC, and display control systems. It is a compact device, measuring just 8.1mm x 8.8mm, with an operating voltage of 2.4V – 5.5V. The SHT40-AD1B-R2 is also RoHS compliant, and comes with an extended 5-year typical lifetime warranty.