Macro and semi micro cuvettes Sorted by mould cavity number. PMMA or PS. What does ''sorted by mould cavity number'' mean? Injection moulds which produce 8 cells in one cycle have 8 cavities. For serial analysis only cells with the same cavity number should be used; to minimise cell-to-cell variation. Quality characteristics: -Minimal extinction value variation. -Optically perfect transmission range -Recessed window; to protect against scratches -Arrow head marking shows the direction of transmission. Advantages to user: -Ideal for kinetics measurements -1000 cells from the same cavity in each pack -Practical packaging: clear; re-closable. Polymethylmethacrylate (PMMA) cuvettes Typical operating range: from 300nm to 900nm. Standard deviation at 320nm ± 0.004 extinction units. Polystyrene (PS) cuvettes Typical operative range: from 340nm to 900nm. Standard deviation at 360nm ? ± 0.005 extinction units. Macro cell with 4 optical windows; PS / UV-transparent Particularly suitable for fluorescence spectroscopy. The UV version can be used from a wavelength of 230 nm and shows minimal autofluorescence. Standard deviation: Cuvettes of Polystyrene (PS) at 360 nm ? ± 0.005 extinction units; cuvettes UV-transparent at 240 nm ? ± 0;007 extinction units and at 300 nm ? ± 0;005 extinction units.