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Measuring range: 4.6-230ppm/ 2-100ppm/ 0.5-25ppm
Number of pump strokes: 1/2(50ml)/ 1(100ml)/ 4(400ml)
Sampling time: 1 minute/1 pump stroke
Detectable limit: 0.2 ppm（400ml）
Shelf life: 2 years (necessary to store in refrigerated conditions; 0～10℃)
Operating temperature: 0～40℃ (temperature correction is necessary for 1/2 pump strokes)
Operating humidity: 10~90% RH (humidity correction is necessary for 1 and 4 pump strokes)
Reading: Direct reading from the scale calibrated by 1 pump stroke
Colour change: Yellow→red
