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Hanna Free & Total Chlorine, Total Hardness, Iron and pH Ion Specific Meter  Ref: HI-96745

Range   Free Chlorine: 0.00 to 5.00 mg/L (ppm); Total Chlorine: 0.00 to 5.00 mg/L(ppm); Total Hardness: 0.00 to 2.00 mg/L (ppm);Iron: 0.00 to 1.60 mg/L (ppm); pH: 6.5 to 8.5 pH
Resolution   Chlorine: 0.01 mg/L (ppm); Total Hardness: 0.01 mg/L (ppm);Iron: 0.02 mg/L (ppm); pH: 0.1 pH
Precision   Chlorine: 0.03 mg/L (ppm) 3% of reading; Total Hardness: 0.11 mg/L (ppm)5% of reading; Iron: 0.01 mg/L (ppm) 8% of reading; pH: 0.1 pH
Light Source   Tungsten lamp
Light Detector   Silicon photocell with narrow band interferencefilter @ 525 nm
Environment   0 to 50C (32 to 122F); RH max 95% non-condensing
Power Supply   (1) 9V battery
Auto-off   After 10 minutes of non-use in measuring mode;after 1 hour of non-use in calibration mode
Dimensions   192 x 102 x 67 mm (7.6 x 4 x 2.6?)
Weight   290 g (10 oz.)
Method   Chlorine: Adaptation of the EPA 330.5 Method, DPD; Total Hardness: Adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th ed. Calmagite/colorimetric method; Iron:Adaptation of TPTZ method; pH: Phenol red method