천연 가스 석탄 가스 메탄 유독 가스 탐지 교정 인증

for our model AS8800A Combustible Gas leak Detector Natural Gas Coal Gas Methane Toxic Gas Tester Air Quality Analyzer Monitor, and each unit will be with calibraton certification before sent out.and this instruments was with Long flexible stainless probe reaches all areas.Gas detectors can be used to detect combustible, flammable and toxic gases, and oxygen depletion, etc.