Range : 200 to 600 ppm
Resolution : 1 ppm
Accuracy @ 25°C : ±6% of reading
Light Source : light emitting diode @ 610 nm
Light Detector : Silicon Photocell
Environment : 0 to 50 °C (32 to 122 °F); max 95% RH non-condensing
Battery Type : (1) 1.5V AAA
Auto-off : after 10 minutes of non-use
Dimensions : 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5″)
Weight : 64 g (2.25 oz.)
Method : adaptation of the zincon method