Vintage Hellige Comparator Nalco Used for Water Quality Testing 1950s or earlier with 4 store Color Discs Bakelite Tester

store Hellige Comparator Nalco, used for water quality testing. This includes two acrylic test tubes, the Bakelite (or similar old plastic) test tube and indicator holder and 4 color discs. All pieces except the box are in very good condition. The box is water damaged inside, missing the top handle and all pieces could use some clean up. Please see photos. Box measures 6 x 4 1/2 x 5 inches tall.