The OT-300 Harvest Monitor assists in determining the optimum time to harvest Rice. From the day Rice sprouts, it is necessary to measure the Rice Paddy's ripening. When the cumulative temperature reaches 1,000 °C, the Paddy is at its peak for harvesting. There is a real danger, however, of harvesting too early or too late. Harvesting at the appropriate time guarantees the best yield and quality. With the OT-300, simply set the Rice Paddy yield just once and it will automatically measure the cumulative temperature and display the optimum time to harvest.