Vintage DuBois Water Hardness Kit w/ Wood Box Paper Labels DuBois Water Hardness Determination Kit Paper Labels Inside old wood box is Buffering Glass Bottle ( paper label ) 1/2 full Titrating Solution Glass Bottle ~ Empty Indicator Solution Glass Bottle ~ 1/2 Full ( not sure of age of these so probably can't be used ) Glass tube ~ Kimax and other little items. Wood box is 6 3/4" x 3 3/4" x 5" tall Inside lid of box has paper label with directions for hardness and determination The Du Bois Co.
Product Description Culture tubes are constructed of KIMAX-51 borosilicate glass for excellent chemical durability and resistance against sodium leaching. They feature sturdy, uniform bottoms and consistent lengths. The 6x50mm tube is also known as a "Durham" tube.
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