Here is something a bit different A wonderful complete sikes distillery hydrometer by Holborn. It is in its original case, it is missing the name plate on the front of the box all the weights are matching with the correct serial number on each weight and it had the correct thermometer. All in remarkable condition considering it's age.

I understand that these measure the specific gravity or density of liquids which can give you the alcohol content in your beer wine or gin. great for the home brew kit