Nessler tubes are used for comparison of color and turbidity between solutions. They are available in tall or short form, and the tubes are often used to carry out a series of calibration solutions of increasing concentrations, meaning they can function as a comparative scale. To minimize differences in the subjective impression of the color of the substance to be analyzed, cylinders of a series should have the same characteristics—height, diameter, and glass thickness.

SP Wilmad-LabGlass Low Form Color Comparison Tubes, SP Industries

Supplier: SP Industries

Used to view and compare the color of various solutions samples, these borosilicate glass Nessler low form color comparison tubes are unmatched and graduated at specific points.

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Nessler Color Comparison Tubes, Low Form, Kimble Chase

Supplier: DWK Life Sciences (KIMBLE)

The top graduation line on unmatched Kimble Nessler Color Comparison Tubes may be any distance from the outside bottom within the range of scale lengths shown in individual descriptions.

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KIMAX® Nessler Color Comparison Tubes, Tall Form, APHA Standard, Kimble Chase

Supplier: DWK Life Sciences (KIMBLE)

These narrow, tall tubes with a long scale length feature 'Shadowless Bottoms' that transmit undistorted light from a source beneath tube. All graduation lines and legends are printed in white ceramic enamel.