Reagent tubes from Kitagawa is a simple and cost-effective sampling system where continuous gas detection over time is not necessary. No calibration is required and tests can be performed without training or previous experience in gas detection. The principle is easy, a reagent tube is introduced into the reagent tube pump AP-20, only a light stroke of the pump is needed. The gas concentration is now established by reading the scale. There are reagent tubes for over 300 different gases and different accessories for different applications.