The MD 100 and MD 200 Photometers provide photometric detection to measure the COD concentration in mg/l O₂. The meters can be supplied as standalone units or as a COD measurement set including the reactor, two packs of COD (small scale Sealed Tube) tubes: one set for LR measurements of 0-150 mg/l and one for MR measurements of 0-1500 mg/l and full instructions. The Photometer's waterproof sample chamber, large digital display and user-friendly keypad ensure maximum operating reliability and convenience.