Flow cells allow the sample to pass through the cell and are connected to the sample source via tubing. Long path length flow cells are useful for low concentration samples and require the long path length rectangular cell holder. They can be used with a Cary 100/300 series Routine Sampler Accessory or a Cary 50/60 series Sipper. Sub-micro flow cells are suitable for use with the Cary 100/300 series Routine Sampler Accessory. Flow cells can also be used with a 8453 UV-Vis.