The learning kit for MQ series gas sensor modules includes the modules MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, MQ-8, MQ-9 and MQ-135 and is suitable for air quality detection with Arduino ESP8266/32.--DTE

9-in-1 Learning and Development Kit with MQ Series Gas Sensor Modules: Get started with environmental sensing now. This kit contains nine of the most popular MQ series gas sensor modules and offers a complete solution for all users – from beginners to experts. Whether you want to learn, develop prototypes, or design a smart environmental monitoring system for your home, this comprehensive kit is the perfect starting point. Module details: The kit includes the following nine sensor modules (the exact models may vary slightly; see product description): MQ-2: Detects flammable gases and smoke (e.g., methane, propane, and hydrogen). Universally applicable, high sensitivity. MQ-3: Specifically detects alcohol vapors (ethanol). Commonly used in breathalyzers. MQ-4: Detects natural gas (methane, CH4), high sensitivity. MQ-5: Detects liquefied petroleum gas (LPG), natural gas, and town gas. MQ-6: Detects LPG and isobutane. MQ-7: Specifically detects carbon monoxide (CO). High sensitivity to carbon monoxide (CO). MQ-8: Detects hydrogen (H₂). MQ-9: Detects carbon monoxide (CO) and combustible gases. MQ-135: Analyzes air quality and detects harmful gases (benzene, ammonia, sulfides, smoke, etc.). Frequently used as a sensor for comprehensive air quality assessment.