Demista Instruments manufactures and markets compost monitors for measuring both oxygen and temperature with one instrument. The Model OT-21 oxygen/temperature monitor and the Model O-21 oxygen only monitor has been sold in the United States, Canada, Mexico, Europe, Australia, Asia, and the Middle East.
Model OT-21 - Compost Monitor
Use the model OT-21 compost monitor to keep aerobic microbes active and decrease composting time, reduce odors, kill weed seeds, and reduce pathogens.Not only will you save on the overall composting time, you will save time in taking measurements. You use only one instrument to take both oxygen and temperature measurements.