Detector tubes measure concentrations of different gases in different environments. It utilizes a chemical reaction to the substances measured with a special reagent filled in a thin glass tube. When air containing the substance to be detected passed through the tube, the reagent would change its color.

The detector tube method permits a simple, quick and economical analysis at the work site. Today, this technology has been widely applied to measure concentrations of a huge variety of substances, with great improvements in measurement accuracy and reagent stability that contributes to the prolonged shelf life of detector tubes, and the means of concentration reading.

Detector tubes are thin glass tubes with calibration scales printed by which you can directly read concentrations of the substances (gases and vapors) to be measured. Each tube contains detection reagent(s) that are especially sensitive to the target substance and quickly produces a distinct layer of color change. The tubes are hermetically sealed.

In order to use the tube, break off both ends and connect the tube to the gas sampling pump with the directional arrow pointing toward the pump.