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Compost Sensor is an open source sensor system for monitoring and recording the temperature and moisture of active compost. It is for small scale commercial composting operations to help with quality control and the certification processes.

http://www.instructables.com/id/Compost-Sensor/
compost
"Smart Farm" tools
sensors
Arduino
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compost sensor

Please take a look at the Instructable for detailed build instructions. If you find the iframe irritating (I do), the links are included just below:

Soldering