1.The same level as The analog signal and output signal; the analog signal output range is 0-5V. The analog signal can be directly connected to the AD acquisition; the digital signal output has a lower effective signal. LED lights. It can be directly connected to the IO port of the micro controller; the sensitivity of the sensor can be adjusted.

2.You can set the value of the sensor. The gas output is low. Can be directly connected to the micro controller;

3.Formaldehyde.toluene.XYENE and other volatile gases have high sensitivity. Can be used for air quality testing;long service life,stable and reliable;fast response and recovery function. Easy to install.