The tester is simple to use; just add a drop of juice to the end and look through it against a bright light. A line will show on the internal scale to let you know the exact sugar content and potential alcohol content. If you are making alcohol and the sugar level is too low, more sugar can be added.
Measures from 0 to 40% sugar (to an accuracy of 1/5 of 1%) and estimates 0 to 25% potential alcohol. An unusual and very useful tool.
6-1/2" overall. Complete with storage case, juice dropper and instructions.