Light source : tungsten lamp
Light detector : silicon photocell with narrow band interference filter @ 525 nm

Range : Free Chlorine (P1): 0.00 to 5.00 mg/L (ppm); Ultra High Range Chlorine (P2): 0 to 500 mg/L (ppm);
Resolution : Free Chlorine (P1): 0.01 mg/L from 0.00 to 3.50 mg/L; 0.10 mg/L above 3.50 mg/L; Ultra High Range Chlorine (P2): 1 mg/L from 0 to 200 mg/L; 10 mg/L above 200 mg/L
Accuracy @ 25°C (77°F) : Free Chlorine (P1): ±0.03 mg/L ±3% of reading; Ultra High Range Chlorine (P2): ±3 mg/L ±3% of reading
Method : adaptation of the Standard Methods for the Examination of Water and Wastewater, 4500-Cl method
Auto-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
Weight : 360g (12.7oz.)
Battery type : 9V battery
Dimensions : 193 x 104 x 69 mm (7.6 x 4.1 x 2.7”)