Hardness, Calcium Range : 0.00 to 2.70 mg/L (ppm) calcium hardness as CaCO3
Hardness, Calcium Resolution : 0.01 mg/L
Hardness, Calcium Accuracy : ±0.11 mg/L ±5% of reading
Hardness, Calcium Method : adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th ed. Calmagite method
Photometer/Colorimeter Light Source : tungsten lamp
Photometer/Colorimeter Light Detector : silicon photocell with narrow band interference filter @ 525 nm
Battery Type/Life : 9V battery
Automatic Shut-Off : after ten minutes of non-use in measurement mode; after one hour of non-use in calibration mode; with last reading reminder
Environment : 0 to 50°C (32 to 122°F); RH max 95% non-condensing
Dimensions : 193 x 104 x 69 mm (7.6 x 4.1 x 2.7”)
Weight : 360g (12.7oz.)