Baumé Hydrometer Includes case and instructions Used for home pottery, but no longer needed, so I'm selling it. The condition is good, with no scratches. Used to measure the specific gravity of liquid glaze. Insert the hydrometer vertically into the glaze and read the value at the liquid surface. For general glazes, it is used in the range of 40-45. Size: Total length 160 Price: ¥2970