After messing around with inadequate glasses or bottles for taking hydrometer readings during my first 2 batches I bought this. It makes reading the hydrometer very easy and is stable on your table when being used. It is made of a very clear acrylic which is more brittle than some other graduated cylinders I have used in the lab. However, the clarity makes it a good vessel for reading the markings on your hydrometer and evaluating the color of you sample. Will buy again if I ever need to replace.
The jar is large, which leads to 2 draw backs. 1.) It sucks volume from your beer for a simple gravity reading. 2.) It is easy to knock down and constantly in the way. The base also chips easily, making it even more likely to topple.