The MQ-3 is a sensor board that detects the concentrations of the targeted gas in the air and gives you a corresponding analog voltage. It can measure the concentrations of harmful gases in the environment; ammonia, aromatic components, sulfide, gasoline vapor, cigarette smoke and other similar harmful gases in the range of 10 - 1000ppm.

• Works with a voltage of 5V
• Dual signal output (Analog and TTL output)
• It has a high sensitivity to sulfide, gasoline vapor, cigarette smoke and other harmful gases.
• Long lasting and stable;
• Quick response
• Easy assembly