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MQ135 5V NH3 NOx Alcohol Benzene CO2 Smoke Gas Sensor Set 3.3 V for ESP8266 Arduino : Amazon.de: DIY & Tools
Ewall - MQ-135 Gas Module Air Quality Sensor (NH3,NOx, alcohol, Benzene, Smoke,CO2 ,etc.) for Arduino
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MQ-135 NH3 NOx Ammonia Alcohol Benzene Smoke CO2 Gas Sensor Detector Module For Arduino - Walmart.com
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