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What size test tubes/cuvettes can I use? How do I decide which ones to use?
The TD-700 can accommodate 25 x 150 mm test tubes, 13 x 100 mm test tubes, 10 x 10 x 45 mm cuvettes, minicells, or capillary cells.  The size and material of your test tube or cuvette will depend on your analysis.  For example, 13 x 100 mm test tube is typically used for chlorophyll analyses.  Certain materials transmit specific wavelengths of light better than others, so your analyte's excitation and emission wavelengths will determine the best material for your sample tube.  Glass tubes and cuvettes work fine for most analyses.  Quartz cuvettes are required for excitation wavelengths below 330 nm.  Methacrylate cuvettes are used for analytes fluorescing down to 330 nm.  With regard to size, the greater the diameter of the test tube, the greater the sensitivity achieved (the lower the minimum detection limit).