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FAQ (Sample) Question5 The coloring of a sample liquid is so deep that the boundary line is not clear. What action can I take? Answer In models N-1E, N-2E, etc., the top of the boundary line is blue,and the bottom is white. If the sample liquid is strongly colored,the sample color will overlap with the blue or white color. This makes it difficult to view the boundary line ( examples of sample liquids might be soy sauce, concentrated grape juice, etc. ) . *In this case, make a transparent plate of acrylic acid resin as shown in the following figure. Place one drop ( approximately 1mm in diameter ) of sample on the center of the prism surface, and place the acrylic acid resin plate over the sample drop. The sample spreads thinly between the plate and the prism surface, and light is able to penetrate. It becomes easy to view the boundary line. Furthermore, test piece A ( In the N-3E, the test piece C can be used. ) which we sell can be used for the above purpose, instead of acrylic acid resin plate.