Hanna Instruments HI 83209-01 - Manual (Page 55)

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• Press or to return to the measurement screen.
INTERFERENCES
Interference may be caused by:
Phosphate above 60 mg/L
Phosphate above 75 mg/L
Sulfide and high concentration of iron
Eliminate color and turbidity interferences by zeroing the meter with the original water sample.
Silica