How do we test the pH? - pH probe and pH test strips, How do we test nitrate/nitrite levels? - Nitrate/Nitrite test strips, How do we measure the amount of total dissolved solids (TDS) - Conductivity Probe, How do we measure the amount of dissolved oxygen? - Dissolved Oxygen Probe, How do we measure the amount of phosphate? - With a "powder pillow" and the spectrophotometer, How do we measure the mass of the total solids? - Mass an empty beaker, boil with water sample, take mass at the end,

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