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Medical Definition of Duboscq's colourimeter
1. An apparatus for measuring the depth of tint in a fluid by comparing it with a standard fluid; glass cylinders are immersed in each of two cups one containing standard fluid, the other the fluid to be tested; on looking through the cylinders, the tints are equalised by raising or lowering the cylinder in one cup, and the extent of this raising or lowering is indicated on a scale and gives the exact difference in tint. (05 Mar 2000)