The MH-Z9041A laser methane gas sensor (hereinafter referred to as the sensor) is a home-use methane sensor that detects methane gas based on tunable laser gas absorption (TDLAS) technology. It employs a through-beam optical path structure, featuring excellent gas selectivity, oxygen independence, resistance to moisture and poisoning, and long lifespan. It incorporates temperature control and compensation algorithms for accurate methane gas measurement and has a serial port output interface for ease of use. This sensor is a high-performance device that tightly integrates mature laser gas absorption detection technology with stable optical path and circuit design.