I feel very foolish! I have NO experience with a hydrometer. (only a refractometer). This will be my first attempt at home brew and I'm almost ready, however; I can not figure out this hydrometer. Every attempt I make to calibrate is a failure. The directions say it will float. This is not so. It does spin away from the sides of the jar, but always sinks to the bottom of every liquid. Can anyone tell me how to work this thing?