Knowledge Base

The onboard temperature and RH sensor is a Sensirion model SHT71 device. You can find full specifications for the sensor at: http://www.sensirion.com/en/01_humidity_sensors/05_humidity_sensor_sht71.htm
Please familiarize yourself with that information. Note in particular that any humidity sensing element must necessarily be exposed to the ambient air, and can damaged by certain chemicals and fumes.