What are gas detector tubes?

Gas detection or gas detector tubes as they’re known are glass tubes that are filled with chemical reagent that absorbs and reacts with the target gas or vapour being measured as part of a gas detection programme. A colorimetric stain (a colour change) is created. For most detector tubes, the concentration is read directly from the measurement scale on each tube. The detector tube system is comprised of a handheld air sampling pump and detector tubes.