Reagent COD is test equipment for chemical oxygen demand. For determination of high range Chemical Oxygen Demand (COD) by the Reactor Digestion method. US EPA approved for wastewater analysis using Hach Method 8000. Range: 20 -1500 mg/L COD. Pack of 25 vials. Reagent COD consists of 3 elements, namely: Low Range (LR) and High Range (HR) vials