MQ-9 Carbon Monoxide, Methane and LPG Gas Sensor Module This is MQ-9 Carbon Monoxide, Methane, and LPG Gas Sensor Module

MQ-5 Gas Sensor If you want to detect different types of gases, you will need sensors. If you need any

The MQ-6 LPG – Isobutane – Propane Gas Sensor a semiconductor gas sensor that detects the presence of LPG, Isobutane,

MQ3 alcohol sensor Used to measure the level of alcohol in the air/breath or related work Operating voltage: DC 3-5V.