The Plastic Trial Jar from Youngs is the perfect tool when testing your brew. Pour some of the brew into this trial jar you can then pop your hydrometer into the solution so you can see the specific gravity or density reading of the liquid. This can show you if the brew has finished fermenting as beer kits give an approximation of what the SG should be. When your hydrometer reads the same value specified in the instructions you know it\'s then ready to bottle or barrel. Trial Jar Features Youngs Trial Jar (Plastic)/5351 100ml Gives an approximation of what the SG should be Tool for testing brew Youngs\' Ref. MPN: 5351Colour: ClearSizes: 100mlPM Ref: 328296