A refractometer allows you to read the specific gravity of a liquid without needing to take a large sample from your fermenter, as you would if you were using a hydrometer. This device requires just a drop of solution and a light source so you can read the gradations. In addition, the automatic temperature compensation (ATC) means that you do not have to do any computation to offset the temperature.
2. The Brew Hauler
The Brew Hauler is a carboy carrier that makes a glass or plastic carboy easy and safe to carry. The webbing is tough and strong and the buckle makes the carrier easy to load and unload. I do not (yet) have one of these but my friend Jason does. It is much easier to move carboys around with these, rather than using one hand to steady the neck and the other to cradle the bottom. That is an accident waiting to happen. This device can save you some time and energy and possibly help you avoid a trip to the hospital.