This reagent set contains Lovibond's Powder Pack™ Reagents. Powder Pack Reagents are pre-measured, unit dose reagents that have been formulated for use in Lovibond's Aqua Comparator Test Kits, the SC450 Single Parameter Colorimeter Series, MC500 Multi-Parameter Colorimeter, and the SP600 Spectophotometer. These easy-to-use reagents for water analysis offer an extended shelf life. They can also be used in other manufacturer's spectrophotometers, colorimeters and test kits. Why pay more for the same results? Lovibond will stand behind the comparability of results.