Seeed Studio Grove Multichannel Gas Sensor v2 provides stable and reliable gases detecting function within any other four sorts of gases. This sensor detects a variety of gases except for gases like Carbon monoxide (CO), Nitrogen dioxide (NO2), Ethyl alcohol(C2H5CH), and Volatile Organic Compounds (VOC). The grove multichannel gas sensor comes in a compact size for easy deployment. This sensor evaluates GM-102B, GM-302B, GM-502B, and GM-702B sensors. The gas sensor is based on MEMS technology and is more suitable for qualitative than quantitative measurement.