Alcohol and sugar content measuring device

A measuring apparatus for measuring at least one property of a medium, the measuring apparatus comprising:

• a density measuring device configured to measure a density of the medium;
• a speed of sound measuring device configured to measure a speed of sound in the medium, wherein the speed of sound measuring device comprises at least one pressure measuring cell, which includes a pressure sensor and an adjustable pressure piston, which is configured to enable adjustment of a volume of the at least one pressure measuring cell;
• a temperature measuring device configured to measure a temperature of the medium;
• an electronic measuring/operating circuit;
• and
• a housing in which the density measuring device, the speed of sound measuring device, the temperature measuring device, and the electronic measuring/operating circuit are disposed,
• wherein the electronic measuring/operating circuit is configured to operate the density measuring device, the speed of sound measuring device, and the temperature measuring device and to determine at least one of an alcohol, sugar content, and a type of sugar of the medium based on density measured values, speed of sound measured values, and temperature measured values of the medium,
• wherein the electronic measuring/operating circuit is configured to determine a compressibility of the medium from pressure measured values at at least two different pressure measuring cell volumes of the at least one pressure measuring cell and from the density measured values resulting therefrom, and to determine a speed of sound in the medium from the determined compressibility,
• wherein side surfaces of the at least one pressure measuring cell each have a surface area (FI) of at most 3 square centimeters (cm2), wherein the side surfaces each have a maximum dimension (MA) such that:
• MA
• =
• F
• ·
• FI
• ^
• 0.5
• ,
• where
• ⁢
• F
• <
• 5
• ,
• wherein the at least one pressure measuring cell has a maximum volume of less than 5 cubic centimeters (cm3).