CO2 Gas Purity Tester has been developed to measure the purity of CO2 up to 99.995% in a quick, easy and reliable way. Our offered tester consists of a caustic reservoir and calibrated absorption burette mounted to a PVC polished frame. In this CO2 Gas Purity Tester, the reservoir and burette are held to the frame with two neoprene covered mounting bands that are adjustable from the rear side of the frame.