Accurate accounting of manufactured products plays an important role in the production of ethanol and other ethanol-containing substances. To optimize the accounting of the produced products and their shipment to the consumer, various methods of determining the quantity are used: instant (per unit of time) and portion (volume, weight). For commercial accounting of the produced ethanol, enterprises often use technical (liquid) measuring instruments of the 1st class. The volume of ethanol in these containers is strictly determined by filling and draining the liquid using reference means for measuring their volume.