This is a set of two high-quality macro cuvettes, precision-made from optical glass. Each cuvette features a long 50 mm path length and a large 17.5 mL volume, making them ideal for measuring samples with very low concentrations or for applications requiring high sensitivity.These cuvettes are designed for all standard spectrophotometers. They are suitable for all applications in the visible (Vis) and near-infrared (NIR) spectrum, but are not intended for deep UV measurements (e.g., DNA/RNA). Lids are included to prevent spills and sample evaporation.