The excess air coefficient 0~99.99 0.01 ≤ ± 2.5% O2 (optional) 0 ~ 25% 0.1% shown value error: < ± 5%; Repeatability: ≤ 2%; Response time: ≤ 90s; Stability: the value change ≤ 5% within 1 hours. SO2 0~5700 mg/m3 (optional) Maximum overload 14000 mg/m3 1 mg/m3 NO 0-1300 mg/m3 (optional) Maximum overload 6700 mg/m3 1 mg/m3 NO2 0~200 mg/m3 (optional) Maximum overload 2000 mg/m3 1 mg/m3 CO 0-5000/25000 mg/m3 (optional) Maximum overload 25000 mg/m3 1 mg/m3 CO2 (optional) 0~5% (extensible) 0.01% H2S 0-300 mg/m3 (optional) Maximum overload 1500 mg/m3 1 mg/m3 Sampling pump load capacity greater than or equal to 30 L/min (resistance to -20kPa) Data storage capacity of 1000 groups The maximum sample volume of 999999.9L 0.1L ≤ ± 2.5% Dimensions 330 x 160 x 200mm The whole weight of about 10 kg The power consumption of <100W * multifunctional smoke sampling tube (1.5m) can be customized according to customer demand, each with 1 plus 1500 yuan * multifunctional smoke sampling gun (with 10 stainless steel cartridge