CHEMetrics™ Mercury-free COD Reagent Vials, 0-1500 ppm (High Range - HR), 25 vials, K-7361S. Test Method: Dichromate Reactor Digestion. Includes: 25 vials (everything needed to perform up to 24 tests except for distilled water) Additional Requirements: Digestor Block that can maintain 150 °C. V-2000 photometer, COD photometer or a