$10.95 each
The RHT03 (also known by DHT-22) is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn't require extra components so you can get right to measuring relative humidity and temperature.

· 3.3-6V Input
· 1-1.5mA measuring current
· 40-50 uA standby current
· Humidity from 0-100% RH
· -40 - 80 degrees C temperature range
· +-2% RH accuracy
· +-0.5°C
Spec sheet available in PDF format.
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Seth Burgin from PHOENIX, AZ USA
Close enough for what I do!
After 55 years one of our guitars developed a crack. Fine musical instruments and some master tapes, along with other items should be stored in a controlled environment. This can be an integral part in controlling a humidifier, & thermostat. Newer furnaces, have a humidifier, but you can add a separate humidifier. 45% RH is about optimum! You can both monitor, control and even chart your temp & RH with this, and some other parts! It's pretty accurate too. I even put one in the stickering, racking & drying room for seasoning fine hardwoods.