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 Choosing Your First Fermenter Explore the options for your first fermentation vessel. Article FREE Making Wine In A Limited Space For many home winemakers, space — or the lack of it — is the final frontier, the one thing holding their winemaking aspirations back. See how some home winemakers have dealt with this problem.