The item shown is a glass hydrometer, a laboratory instrument used for measuring the density or specific gravity of liquids.
Function: It is commonly used to measure the alcohol content in spirits and liquors, with some models designed specifically for high concentrations.
Scale: The visible scale ranges from low numbers up to 95, indicating a high-concentration measurement instrument.
Design: It consists of a sealed glass tube with a weighted bulb at the bottom, which floats higher or lower in the liquid based on density.
Material: Made of glass with a paper or printed scale inside the stem