HR+ COD Vials 0-15,000ppm HR+ Mercury-free (100 Count)High Range Plus, COD vials comes in a cardboard box and contains 98 vials, enough to perform up to 97 tests and instruction book. All COD Kits require the use of a Digestor Block and the V 2000 Photometer, an A 7325 COD Photometer, or a spectrophotometer capable of accepting a 16 mm round cell. Photometers sold separately. A fresh reagent ampoule blank must be prepared for each series of tests; therefore the number of samples that can be tested with