These cuvettes are an excellent choice for most spectrophotometry applications in the visible range. Manufactured from polystyrene (PS) or polymethyl methacrylate (PMMA or 慉crylic?), they provide accurate, reliable results, even at wavelengths as low as 300nm and are grouped by manufacturing mold cavity number to ensure the lowest variation in extinction coefficient. These disposable cuvettes are available in macro and semi-micro sizes to accommodate most sample volumes. Semi-micro cuvettes require only 1.5mL of sample volume. Cuvettes include an arrow mark to indicate direction of transmission and reduce variation. Compatible with most spectrophotometers and photometers.