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Gas detector tubes use well established technology to take 'grab samples' of suspected gases. The readings are generally referred to as 'qualitative', since the accuracy ranges +/- 20% of the actual value. The variety of gases available to be measured is extensive, and most of them are not readily detected by more common 4-gas meters. It is the ability to get an on the spot gas reading, with very little in the way of equipment or expense, that has made these colorimetric gas detection tubes so popular.