Wireless Data Logger monitors CO2, temperature, and humidity.

Equipped with tethered sensor, RFCO2RHTemp2000A Data Logger can monitor CO2 levels within building, room, or enclosed space, while simultaneously measuring and recording ambient temperature and relative humidity. Unit displays current real-time

[source: http://news.thomasnet.com/fullstory/Wireless-Data-Logger-monitors-CO2-temperature-and-humidity-20032831]