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Designed for growers and technicians already monitoring pH, Dissolved Oxygen, and Temperature with instrumentation. The Model AQ-3 offers the same convenient packaging as AQ-2 without the chemical tests for pH, Dissolved Oxygen, or the Thermometer. Parameters include: Ammonia Nitrogen, Nitrite Nitrogen, Alkalinity, Carbon Dioxide, Chloride, Dissolved Oxygen, and Total Hardness. Use for aquarium and fish farming applications