... one device multi-functional 3. Welcome OEM IntroductionWe, Beijing Dashiweiye Tech Co, Ltd., is grown out of Haolian Design Center. We design and ... places at the scene detection; Technical specification Technical indicatorParameterMeasuring range CO: ( 0~1000) ppm; ( 0.00~4.00 ) %CH4Measurement errorCO: ( 0 ...