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keyes MQ-135 Air Quality Sensor for Arduino

60 % of buyers enjoyed this product!
In stock
Sale Price: US $2.99
45 days Money back
45 days Money back Returns accepted if product not as described, buyer pays return shipping; or keep the product & agree refund with seller.
On-time Delivery
On-time Delivery
Guarantees: On-time Delivery 60 days


Introduction keyes MQ-135 Air Quality Sensor is specialized for Arduino. Its connection port is compatible for Arduino sensor shield. The sensor use the Stannic oxide as gas-sensitive material which has lower conductivity in clean air. When there is a contaminant gas in the environment in which the sensor is present, the conductivity of the sensor increases as the concentration of contaminant gases in the air increases. This sensor is highly sensitive to ammonia, sulfide, and benzene vapor, and is ideal for the monitoring of smoke and other harmful gases. This sensor can detect a variety of harmful gases, is a suitable for a variety of applications and a kind of low-cost sensor. It can be applied to household and environmental hazardous gas Specifications Operating voltage: 3.3-5V (DC) Interface: 4PIN interface Output signal: digital signal and analog signal Weight: 7.8g Shipping list keyes MQ-135 Hydrogen Sensor*1

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Shipping Company Shipping Cost Estimated Delivery Time
DHL 3 - 7 days
UPS Expedited 3 - 7 days
EMS 5 - 14 days
Post Air Mail Free Shipping 15 - 45 days
Return Policy If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.

N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion.
Seller Service On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe).

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Price:  US $2.99 / piece