... Petroleum,Petrochemical,Metallurgy,Electronic,Municipal,Telecommunications, safety detection of traffic tunnel,Semiconductor industry and others need ... is small,easy to carry and useSpecification:Detection Principle Electrochemical sensorsAccuracy ±5% F.SDisplay and ... annex hasCertificate, airway tube , charger, manual .Detection gas type and measurement rangeMeasured gasroduct TypeDetection Principle ...