MQ-135 Air quality detection sensor module

MQ-135 Air quality detection sensor module

The gas sensitive material used in the MQ135 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When the sensor is stored in the environment

When polluting gases, the conductivity of the sensor increases with the concentration of pollutants in the air. The change in conductivity can be achieved using a simple circuit

Convert to an output signal corresponding to the concentration of the gas.

About Shipment:

1. 1 Unit shipment usually ship via economic shipping way,like China Post or other small packet post air shipping,see China post shipping sample below,we usually ship with tracking number provided,small package usually take 2-5 week to most Country from Europe,America.Africa or Mid-East may longer,delivery time is decided by shipping company,we'll provide tracking site for your tracking.
2. If you order more quantity or bigger value,we may ship via DHL/UPS/Fedex or other fast shipping way for you.You can also contact us to talk the best shipping cost.Due to online shipping cost may not calculate so correct.
3. Once parcle arrived your local customs,please catch time to contact with customs clearrance,usually it just pay tax or some documents.If you need something we help,contact our sales to talk.