FAQ
Q1. What if a gas detector tube does not change any colours after sampling?
A. Confirm that the front cap of GV-100 sampling pump is firmly tightened. After confirming that the pump handle is fully in, insert unbroken tube into the rubber inlet of the pump and perform an air leak test on the pump to ensure a vacuum is created.　 Ensure that the gas detector tubes are kept in a cool place or in a refrigerator.