Hardness, Total Range : Hardness LR: 0 to 250 mg/L; Hardness MR: 200 to 500 mg/L; Hardness HR: 400 to 750 mg/L (ppm) CaCO₃
Hardness, Total Resolution : 1 mg/L from 0 to 100 mg/L, 5 mg/L from 100 to 750 mg/L (ppm) CaCO₃
Hardness, Total Accuracy : Hardness LR: ±5 mg/L ±4% of reading; Hardness MR: ±7 mg/L ±3% of reading; Hardness HR: ±10 mg/L ±2% of reading
Hardness, Total Method : adaptation of the EPA recommended method 130.1
Photometer/Colorimeter Light Source : light emitting diode
Photometer/Colorimeter Light Detector : silicon photocell with narrow band interference filter @ 466 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 : 9V battery