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DPD Free Chlorine Reagent Dispenser and Reagent Vial, 250 Tests USEPA accepted for reporting drinking water analysis using Hach Method 8021 Sample Size: 10 mL Range: up to 2.00 mg/L Contains 1 Refill Vial with enough reagent for 250 Tests Backed by over 20 years of DPD experience! For best results...