As mentioned in another post, I only ended up with 7.3 beers in my last brew. Per several suggestions, I bought a hydrometer so I can start to learn how to use it. When I saw the video provided by NB, I saw that there was quite a lot of liquid used for the test. I have also read that you do not want to add this sampling of beer back to the batch, so it is a loss. If you are supposed to do this a few times, how much beer are you sacrificing in the process, and is it perhaps not a best suited practice for a 1 gallon batch, vs. a 5 gallon batch?