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Method
The detector tubes are filled with a reactive chemical that reacts to certain gases (the targeted gases), these chemicals are dispersed over an absorbent silica gel which then discolors proportionally in order to illustrate the concentration of contaminants in the system! This is performed by drawing the gas through the tubes with the hand/sample pump wherewith the chemical react takes place.   Detector tubes a supplied as calibrated and are sealed, tested per batch number, it is recommended to keep the test tubes cool dry and not placed directly in sunlight to ensure a consistent and accurate reading.  
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