Measured gas: oxygen, carbon monoxide, hydrogen sulfide, combustible gas, carbon dioxide, ozone, ammonia nitrogen TVOC, toxic and harmful gases, etc. Detection principle: electrochemical principle, infrared principle, catalytic combustion principle, PID photoion principle (depending on the specific measured gas and selected sensor) Sampling method: pump suction, flow rate up to 1L/min, pump suction can be adjusted in ten gears Wide range of options (depending on the specific gas to be measured and the selected sensor) Signal output: USB interface high-speed data transmission, print data can be downloaded (optional), Manufacturer: GUYSGNX