Nitrogen, Ammonia HR (high range) vial reagent, for up to 49 tests.

Range: 0.4 - 50 mg/L NH4-N or 0.5 - 64.4 mg/L NH4. NH3-N and NH3 can be calculated with pHotoFlex pH and a connected pH/temp external probe (range is temperature and pH dependent). pHotoFlex STD can calculate NH3 via multiplier.