⦁ Hardness, Total Range 0.00 to 4.70 mg/L (as CaCO3) ⦁ Hardness, Total Resolution 0.01 mg/L ⦁ Hardness, Total Accuracy ±0.11 mg/L ±5% of reading at 25°C ⦁ Hardness, Total Method adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Colorimetric Method ⦁ Hardness, Calcium Range 0.00 to 2.70 mg/L (as CaCO3) ⦁ Hardness, Calcium Resolution 0.01 mg/L ⦁ Hardness, Calcium Accuracy ±0.11 mg/L ±5% of reading at 25°C ⦁ Hardness, Calcium Method Adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Colorimetric Method ⦁ Hardness, Magnesium Range 0.00 to 2.00 mg/L (as CaCO3) ⦁ Hardness, Magnesium Resolution 0.01 mg/L ⦁ Hardness, Magnesium Accuracy ±0.11 mg/L ±5% of reading at 25°C ⦁ Hardness, Magnesium Method Adaptation of the Standard Methods for the Examination of Water and Wastewater, 23rd Edition, Colorimetric Method ⦁ Iron Range 0.00 to 1.60 mg/L (as Fe) ⦁ Iron Resolution 0.01 mg/L ⦁ Iron Accuracy 0.01 mg/L ±8% of reading at 25°C ⦁ Iron Method Adaptation of the TPTZ Method ⦁ Photometer/Colorimeter Light Source LED with 525 nm bandpass filter ⦁ Photometer/Colorimeter Light Detector silicon photocell ⦁ Bandpass Filter Bandwidth 8 nm ⦁ Bandpass Filter Wavelength Accuracy ±1.0 nm ⦁ Cuvette Type round 24.6 mm diameter (22 mm inside) ⦁ Function GLP ⦁ Display 128 x 64 pixel B/W LCD with backlight ⦁ Logging Memory 50 readings ⦁ Battery Type/Life 1.5 V AA Alkaline (3 pcs.) / > 800 measurements (without backlight) ⦁ Automatic Shut-Off after 15 minutes of inactivity (30 minutes before a READ measurement) ⦁ Environment 0 to 50°C (32 to 122°F); 0 to 100% RH (IP67) ⦁ Weight 380 g (13.4 oz.) ⦁ Dimensions 142.5 x 102.5 x 50.5 mm (5.6 x 4.0 x 2.0″)