"Bruère Colorimetric Kit, Rhône-poulenc, 1930"
Bruère colorimetric kit, Société des Usines chimiques Rhône-Poulenc, circa 1930. Used for measuring the pH of water. 3 colorimetric scales formed by colored tubes, sealed and unalterable, a compensating block for examining the liquid, 5 bottles of reagents (1 empty), missing the test tubes.