We are committed to provide a variety of MQ135 Fuel Sensor. In addition to ammonia (NH3), nitrogen dioxide (NO2), benzene (C6H6), carbon monoxide (CO), and other dangerous gases, it is used to detect a wide range of gases. This sensor normally needs a few minutes to warm up before it can stabilize and give accurate data. The MQ135 Fuel Sensor is frequently used in air quality monitoring systems, indoor air quality evaluation, gas leakage detection, environmental monitoring, and other applications where gas leakage detection or air quality assessment is required.