This kit combines the Marine pH & Alkalinity, Ammonia and Nitrite & Nitrate kits into one kit. MultiTest™ Marine Basic performs over 75 tests and contains a reference sample for validation. Range: pH: 7.80–8.70, alkalinity: 0–∞ , NH3 : 0–6 mg/L, NO2 : 0-25 mg/L, NO3 : 0–50 mg/L. Precision: pH: 0.01 pH units, alkalinity: 0.5 meq/L, NH3 : 0.01–0.1 mg/L, NO2 /NO3: 0.1–1 mg/L
A: The test well you are using may be contaminated with Nitrate Reagent#2. Soak the test well sheet in vinegar overnight, then rinse thoroughly with tap water, followed by DI water, and dry completely.
A: If you are getting a pronounced nitrite reading, it is not possible to get an accurate nitrate reading, since the nitrite reading will interfere. You should be able to make a very approximate assessment of nitrate, since the nitrate color will be additive to the nitrite color.