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The MQ-9 is a gas sensor module designed to detect LPG, CH4 (methane), and CO (carbon monoxide) with high sensitivity. It provides an analog output and is ideal for use in gas leak detection, air quality monitoring, and safety systems.
The MQ-3 Alcohol, Ethanol Detection Sensor Module offers high sensitivity and dual output capabilities, making it an essential tool for alcohol detection applications in various electronic projects.
The MQ-135 Air Quality Detection Module is a highly sensitive gas sensor capable of detecting ammonia, benzene, alcohol, smoke, and CO2, making it essential for air quality monitoring applications.
7918 TO-220 Negative Fixed Voltage Regulator 
