BrandTech 759071D Polystyrene 2.5-4.5ml Macro Spectrophotometry Cuvette (Pack of 100) Minimum volume: 2.5ml, maximum volume: 4.5ml, macro Manufactured from polystyrene (PS), provides accurate, reliable results, even at wavelengths as low as 300nm Accommodates most sample volumes, and is compatible with most spectrophotometers and photometers Includes arrow mark to indicate direction of transmission and reduce variation; adapts to the needs of most laboratory applications Manufactured from high-quality materials, grouped by manufacturing mold cavity number to ensure the lowest variation in extinction coefficient