The HKD MQ Series 9x Gas Detector Kit is a complete multi-gas sensing solution that includes nine of the most popular MQ gas sensor modules, packaged together in a convenient plastic storage box. This full set is ideal for Arduino, Raspberry Pi, ESP32, ESP8266, IoT, robotics, education, and research projects where multi-gas detection, air quality monitoring, and safety systems are required.
Each sensor module in the kit is designed to detect specific gases and environmental conditions, making this bundle perfect for building smart gas alarm systems, environmental monitoring stations, air quality analyzers, safety devices, and industrial prototypes. The MQ sensors are widely used due to their reliability, affordability, and ease of integration with microcontrollers and development boards.
The modules feature analog output (and in many cases digital output via onboard comparator circuits), allowing flexible integration with different systems. With proper calibration, they can be used for quantitative gas detection or qualitative presence detection, depending on the application.
This kit is especially valuable for students, developers, and engineers who want access to a broad range of gas detection capabilities in a single package-eliminating the need to source sensors individually.
Included Sensors & Detection Types
The kit includes 9 MQ gas sensor modules:
- MQ-2 - Smoke, LPG, propane, hydrogen, methane
- MQ-3 - Alcohol (ethanol) detection
- MQ-4 - Methane (CH ) detection
- MQ-5 - LPG, natural gas, city gas
- MQ-6 - Isobutane, propane, LPG
- MQ-7 - Carbon monoxide (CO)
- MQ-8 - Hydrogen (H )
- MQ-9 - Carbon monoxide & combustible gases
- MQ-135 - Air quality sensor (NH , NOx, alcohol, benzene, smoke, CO trends)
Key Features
- Full 9-sensor MQ series kit in one package
- Wide gas detection coverage
- Ideal for air quality monitoring and safety systems
- Compatible with Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and more
- Suitable for IoT, smart home, and industrial projects
- Modular design - each sensor usable independently
- Plastic storage box for safe and organized storage
- Perfect for education, prototyping, and R&D
Applications
- Gas leakage detection systems
- Smart home safety alarms
- Industrial gas monitoring
- Environmental monitoring stations
- Air quality measurement systems
- IoT gas sensing networks
- Educational electronics and sensor training kits
- DIY electronics and robotics projects
The HKD MQ Series 9x Gas Detector Kit is a complete, versatile, and cost-effective sensor bundle that provides everything you need to develop multi-gas detection, air quality monitoring, and safety applications-making it an essential toolkit for makers, students, engineers, and developers working in electronics, IoT, and automation.
What's in the box
1 x MQ-2 smoke gas sensor
1 x MQ-3 alcohol sensor
1 x MQ-4 methane sensor
1 x MQ-5 LPG Natural Gas City Gas Sensor
1 x MQ-6 isobutane propane sensor
1 x MQ-7 carbon monoxide sensor module
1 x MQ-8 hydrogen sensor
1 x MQ-9 carbon monoxide combustible gas sensor
1 x MQ-135 air quality detection sensor
