Waveshare MQ-135 Gas Sensor

The MQ-135 is a long-established, broad-spectrum gas sensor covering a wide range of air-quality-relevant gases at once - ammonia, benzene, alcohol vapour, smoke, and other common indoor air contaminants - making it a practical general-purpose choice when a project needs an overall air-quality indication rather than precise readings of one specific gas. This Waveshare-branded version gives a traceable, quality-controlled alternative to the many unbranded MQ-135 modules on the market, worth the choice whenever consistent sensor-to-sensor performance matters for a project being built in any quantity.