Antique medical colorimeter Jules Dubosque and P. Pellin. (?) Metal. France, early twentieth centuryThe colorimeter compares the colors of the samples with a standard color palette during chemical analysis to determine the concentration and saturation of the sample. Samples are viewed under a monocular microscope. The colorimeter was used in the analysis of urine as well as blood to determine the amount and concentrate of constituent elements in the laboratory for medical diagnostics. A perfect gift for a collector or a replenishment of the collection of scientific instruments. Good preservation, sold with lamp.