The DHT22 / AM2302 is a basic, low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital signal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data. The only real downside of this sensor is you can only get new data from it once every 2 seconds.
Please note the PDF for details regarding the technical data.
59 x 27 x 14mm
Operating Temperature :
Parts as depicted in the photos.