Two pairs of standard optical glass cuvettes (Open-top type, 10 mm light path, 3.5mL volume): The cuvette has a fused optical glass body and 2 transparent windows. It fits all standard VIS-NIR spectrophotometers (such as Shimadzu, Perkin Elmer, GE, HP, and Beckman etc.) and is designed for VIS-NIR absorption applications. Parameters: Cell Material:Optical Glass Top Type:Open-top, Teflon lid. Light Path:10 mm. Cell Volume:3.5 mL. Outside Dimensions. 45mm × 12.5mm × 12.5mm. Spectral range:350-2000 nm.