... tightness and purifying effect is good, easy to change.10,WINDOWS Xp English operating interface, the analysis software adopts ... principleHigh frequency furnace combustion infrared absorption methodMeasuring rangeC:0.00001%-10.0000% ( expandable to 99.99999% )S:0.00001 ... variable amount Accuracy of reading:0.0001gWorking environmentindoor temperature:10-30°C,relative humidity:<75%,voltage:AC220V±5%, ...