Urinometer and Jar in Case The rectangular leather case contains a thermometer and a glass jar. The thermometer is made of glass, features a scale in black ink, marked from 30 to 120 in intervals of 10. It has a metal tip and a glass loop at the opposite end for safer retrieval after insertion into the cylinder, as it was likely used to measure the themperature of a liquid inside the jar. The side opposite the scale is painted white, with the manufacturer’s mark present on the body of the urinometer. 1875-1925