MQ-135 Air Quality Sensor Detection Module

2 sold in last 8 hours
Ednex Shop
Estimated Delivery in 7 To 15 days
Dhs.7.80 AED
  • Lower conductivity in clean air

  • High sensitivity to Ammonia, Sulphide, Benzene steam, smoke, and harmful gases

  • Converts conductivity change to gas concentration output signal

  • Suitable for detecting harmful gases and smoke

  • Sensitivity adjustable

  • Fast response and recovery

  • Signal output instructions

  • TTL output signal is low level

  • Analog 0 ~ 5V voltage output, higher voltage with higher gas concentration

  • Color as shown in pictures

  • Sensitive to benzene, alcohol, and smoke

  • Output voltage increases with the concentration of measured gases
Size Guide


Products and goods sold on our site are expected to meet the highest quality standards and your expectations when you order online. However, in case you decide to return your order / part of any order for any reason, please read our return policy carefully to process your returns. 

Our policy lasts 7 days. If 7 days have gone by since your order has been delivered, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.


To complete your return, we require a receipt or proof of purchase and a RMA (Return Material Authorization) Number.  Do not ship your returns till you have an RMA number.  To get an RMA Number, please call our customer support number and they will provide you with one.  Any item that is not accompanied by all the required documents above will not be accepted for returns.



To return your product, you should mail your product to:

EdNex Educational Aids Trading LLC.

205, Al Reyami Building, Karama, Near Karama PO,

PO Box 124467, Dubai,

United Arab Emirates.


You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

Please use a shipping method that can be tracked and insured when you ship your returns for your own protection. We don’t guarantee that we will receive your returned item.


Refunds (if applicable)

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Unopened Sets:  For unopened sets, refunds will be approved in full (minus shipping and handling) and will be credited to you in the same method payment was made.

Opened Sets: For opened sets, refunds will be in the form of store credit or exchange only.

Software:  No refund will be applicable on software purchased along with another product or stand alone.


Sale items (if applicable)

Only regular priced items may be refunded, unfortunately sale items cannot be refunded.


Late or missing refunds (if applicable)

If you haven’t received a refund yet, first check your bank account again.

Then contact your credit card company, it may take some time before your refund is officially posted.

Next contact your bank. There is often some processing time before a refund is posted.

If you’ve done all of this and you still have not received your refund yet, please contact us at


Exchanges (if applicable)

We only replace items if they are defective or damaged.  If you need to exchange it for the same item, send us an email at and after confirmation from our customer support team, please send your item to:

EdNex Educational Aids Trading LLC.

205, Al Reyami Building, Karama, Near Karama PO,

PO Box 124467, Dubai,

United Arab Emirates.

The MQ-135 Air Quality Sensor Detection Module is designed to detect and measure the concentration of various harmful gases in the air. It features a lower conductivity in clean air and exhibits high sensitivity to gases such as ammonia, sulphide, benzene steam, smoke, and other harmful substances. The module converts changes in conductivity caused by the presence of these gases into a gas concentration output signal, allowing for accurate measurements. It is particularly suitable for applications where the detection of harmful gases and smoke is necessary, such as air quality monitoring systems and gas leak detection devices. The sensitivity of the module is adjustable, enabling customization based on specific requirements. It offers a fast response and recovery time, ensuring timely detection of gas concentrations. The module provides signal output instructions, including a TTL output signal that is in a low-level state. Additionally, it offers an analog voltage output ranging from 0 to 5V, with higher voltage corresponding to higher gas concentration. The MQ-135 Air Quality Sensor Detection Module is sensitive to gases like benzene, alcohol, and smoke. Its output voltage increases as the concentration of measured gases rises, allowing for precise measurements and monitoring. The color of the module is as shown in the pictures provided. With its high sensitivity and reliable performance, the MQ-135 module serves as a valuable tool in assessing air quality and detecting potentially harmful gases. It can be utilized in various applications, including indoor air quality monitoring, environmental monitoring, and industrial safety systems. It is important to follow the manufacturer's instructions and safety guidelines when installing and using the module.
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MQ-135 Air Quality Sensor Detection Module
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