The 109 is a rugged, accurate probe that measures air, soil, and water temperature for a variety of applications. It consists of a thermistor encapsulated in an epoxy-filled aluminum housing. The housing protects the thermistor, allowing you to bury the 109 in soil or submerge it in water. The 109 measures from -50° to +70°C, and it outputs a 0 to 2.2 V signal when using 2500 mV excitation. The 109 is a rugged, accurate probe that measures the temperature of air, soil, or water from -50° to +70°C. It was designed specifically for our CR200X-series dataloggers, but it works with most other Campbell Scientific dataloggers and can be used in a variety of applications.-->