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• Measures free chlorine, alkalinity and pH
• Gradation (Alkalinity): 0 - 80 - 120 - 180 - 240 mg/L CaCO3
• Gradation (Free chlorine): 0 - 0.5 - 1 - 3 - 5 - 10 mg/L Cl2
• Gradation (pH): 6.4 - 6.8 - 7.5 - 7.6 - 8.4