Hach Cod High Range found in: COD2 Digestion Vials, Dichromate, COD Analysis Kits, COD Digestion Vial, Hr+, COD Digest Vials High Range 20-1500mg/L, Mixed.. 16-mm diameter cells. CHEMetrics’ COD vials can be directly used with CHEMEtrics’ single analyte COD photometers, as well as Hachs’ spectrophotometers.