Actually if you know the original gravity (sugar content) of a liquid before and after fermentation then even rudimentary calculations using equipment from wilkos can be very accurate. Even measuring the refractive index of a fermented solution can give a fairly accurate (0.2+/-) reading.
Actually if you know the original gravity (sugar content) of a liquid before and after fermentation then even rudimentary calculations using equipment from wilkos can be very accurate. Even measuring the refractive index of a fermented solution can give a fairly accurate (0.2+/-) reading.