1 Grove - Gas Sensor(MQ-2):Combustible Gas、Smoke [middle sensitivity]
2 Grove - Gas Sensor(MQ-3):Alcohol and Benzine [HIGH sensitivity] Long warmup
3 Grove - Gas Sensor(MQ-5):LPG, Natural Gas, Town Gas [high sensitivity]
4 Grove - Gas Sensor(MQ-9):LPG, CO, CH4 [low sensitivity]
6 Note - Gas sensor need to be heated, first minute the data is incorrect.