The hydrometer I have shows what expected ABV will be if you ferment it all the way so I can get an idea of where I will end up based on when I stop fermentation. The batch I just did was a gallon. I use whatever apple juice is on sale and add sugar to get about 1.070 to 1.100 hydrometer reading. I then ferment with Belgian ale yeast until I get 1.035 to 1.050 reading on the hydrometer, usually 4-5 days. Then I add my meta bisulfite and let it sit for 30 minutes before adding my sorbate. When I add the sorbate I add a cinnamon stick and an once of my flavoring for a gallon batch. Put a cap on and let it sit for a couple days keeping an eye on my CO2 pressure as to not break the bottle. After a couple days I rack into clean sterile bottle and place in the fridge. You can drink it right away or let it sit and age.