Wide Detection Ranges: MQ131 / 136 / 137 / 138 / 139 sensors detect various including o₃ (10-1000ppm), hydrogen sulfide (1-200ppm), ammonia (5-500ppm), formaldehyde (5-500ppm), and (10-1000ppm) for comprehensive air High Sensitivity & Fast Response: Designed with advanced technology to quickly and accurately measure concentrations, ensuring timely detection of hazardous substances in environments Compact & Lightweight Design: Measures only 20.4x32.4mm, making it easy to integrate into environmental systems, industrial setups, and smart home devices durability ABS Construction: Built with ABS for long lasting and resistance to wear in demanding applications like industrial and indoor air Versatile Applications: Ideal for environmental, industrial checks, and home air, providing reliability detection in labs, factories, and residential spaces, Manufacturer: Msioytog