Improved reagent set for sequential determination of free ammonia and monochloramine by the Indophenol method. Replaces 2879700. Requires new procedure (See Reagent/Procedure tab) and instrument software update (See Downloads>Other>Product Notice-Monochloramine and Free Ammonia). Hach Method 10200 Ranges: 0.04 to 4.50 mg/L Cl2 and 0.02 to 0.50 mg/L NH3-N. Set contains reagents for approximately 50 tests.