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YSI 251408Y Nitrogen Ammonia Reagent Powder for pHotoFlex Colorimeter, 0. 01 to 0. 50 mg/L NH4-N; 0. 01 to 0. 64 NH4; NH3-N Range (Pack of 100)
NH4-1 TP Nitrogen, Ammonia, powder pack reagent, pack of 100