The most important task for the thermometer is to determine the temperature at the top of the column during distillation. When required it is also used to check the temperature of the fermenting mash. It is important that the thermometer is accurate at 78°C. It must be a finely calibrated spirit thermometer, and can be graduated in whole degree divisions. Thermometers can be obtained ranging from 40°C to 90°C with 2/10ths degree accuracy. These are considerably more expensive. The right temperature is of highly importance. Widder in Germany supplies thermometers that are calibrated at 78°C under the brand ACA.
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