Standard glass spectrometer cuvette. Used for visible spectrometer (e.g., colorimetric assay). With dark walls.
Path length: 10 mm. Maximum volume: 2 ml. Workable volume: up to 1.5 ml. Dimension: 45x12.5x12.5mm. Made of clear optical glass (320-2600 nm), with a plastic lid and black walls. Reusable. Not for UV spectrometer.