The HI731321 are the replacement glass cuvettes used with the HI7XX Checker HC colorimeters and the HI832XX benchtop photometers. Each cuvette has a 10 ml level mark to measure the appropriate volume. The HI731321 includes 4 cuvettes.

    Index mark for proper alignment in the photometer
    10 ml level mark for adding correct volume
    Optically clear glass