COD Vials Kit. Catalog No.: K-7361S. Range: 0-1500 ppm (HR) Mercury-free. Method: Dichromate Reactor Digestion. Kit comes in a cardboard box and contains everything needed to perform up to 24 tests (except distilled water): 25 vials and instruction book. All COD Kits require the use of a Digestor Block and the V-2000 Photometer, a COD