... principle analyze the CH4 and CO2 BX569A Portable biogas Detectors with pump BX569A portable biogas Detectors with pump, adopting NDIR detecting principle, is ... operation-Simple self calibration program-Adopting high-strength plastics with skidproof rubber,-The housing is hi-strength,feel very ... life:2 yearsDimension:lXbXh,mm: 209X110X40Weight:About 410g BX569A Portable biogas Detectors with pump