The MQ-135 sensor is an air quality measurement module that is highly sensitive to ammonia, sulfur and gasoline vapors. The MQ-135 sensor is a low-cost sensor that can detect various harmful gases.

• Working voltage: 5V DC
• Microprocessor compatible TTL output.
• Analog output. The output voltage varies proportionally to the gas concentration in the air.
• High sensitivity. It precisely measures the concentration of sulfur, gasoline, water vapor, smoke and other harmful gases(NH3, NOx, Alcohol, CO2, etc.).
• It has a long working life and stability.
• Fast response time.
• Ease of plug/unplug for testing with socket probes.
• Works compatible with Arduino and other development boards.