ArticleCalibrate your Winemaking ToolsWritten by Chris ColbyYour hydrometer shows that your must has a specific gravity of 1.100 - but how do you know that's accurate? Learn how to calibrate your hydrometer and all your winemaking tools, so you can be sure.Already a member? Log InYou'll Also Like Article FREE Understanding the Basics of pH Meters pH meters are a crucial piece of testing equipment for winemakers looking to take their hobby to the next level. Learn some basics of why, how, and when. Article MEMBERS ONLY Proper Equipment Storage When done using your winemaking equipment, make sure it is properly cleaned and stored so it will be ready to use next harvest season.