AcuRite Wireless Indoor Outdoor Temperature and Humidity Sensor (06002M) , white

One of the most company sensors on the market, this temperature, and humidity module measures accurately with - +/- 2 degrees (Fahrenheit). Just pair with an AcuRite Access (sold separately) and create custom alerts when weather conditions change that are important to you. The integrated hole allows you to easily mount your sensor outside. On a nail, or with some fishing line, you can easily hang your sensor anywhere.