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Hanna HI782-25 Nitrate HR Checker Reagents sale BET surface area measurements indicateHanna HI782 25 Nitrate LR Checker Reagents Hanna HI782 25 Nitrate HR Checker Reagents is a reagent refill for the Nitrate High Range Colorimeter HI782, designed for marine water testing, providing enough reagent for 25 tests. Reagent refill for Nitrate High Range Colorimeter HI782 Marine Water. Enough reagent for 25 tests. Item #: HI782 25