The Rotronic Humidity Calculator calculates various humidity parameters such as dew point, frost point, vapor concentration, water vapor content, relative humidity, enthalpy, etc. from a given value. You can convert your data with a simple click and discover the impacts on temperature and pressure. A standard glass of wine is 175ml. Assuming the wine is 12% ABV, to calculate how many units of alcohol are in a standard glass of wine, the following equation applies: 12 (%) x 175 (ml) / 1,000 = 2.1 units. Formulas. The ABV Calculator uses the following formulas: Alcohol by Volume Formula (Standard) ABV = (OG - FG) * 131.25 Sep 03, 2019 · This triple scale hydrometer comes in a kit which comes with a 250ml market test jar, cleaning brush, cloth for cleaning your hydrometer carefully and a canvas bag to keep it all in. The hydrometer itself measures specific gravity between 0.99 and 1.17, alcohol volume levels between 0% and 20%, and Brix/Balling between 0-35. Digital Hydrometers (also know as portable density and gravity meters) measure the specific gravity of a battery’s electrolyte. Based on the specific gravity readings of the samples taken and the battery manufacturer’s published specific gravity and temperature reference values, the user can determine the state of charge of the battery.