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Gases to be measured: SULPHUR DIOXIDE
Quantity of tubes/box: 10
Measuring range：20-300 ppm
Number of pump strokes: 1（100ml)
Sampling time: 1 minute/1 pump stroke
Detectable limit: 3 ppm
Shelf life: 2 years
Operating temperature: 0～40℃
Reading: Direct reading from the scale calibrated by 1 pump stroke
Color change: purple→yellow
