DrägerTubes are glass vials filled with a chemical reagent that
reacts to a specific chemical or family of chemicals.
A calibrated 100 ml sample of air is drawn through the tube
with the Dräger Accuro® bellows pump. If the targeted chemical(s)
is present the reagent in the tube changes color and the length of
the color change typically indicates the measured concentration.
The Dräger Tubes System is the world's most popular form of gas