durability ABS Construction: Built with ABS for long lasting and resistance to wear in demanding applications like industrial and indoor air High Sensitivity & Fast Response: Designed with advanced technology to quickly and accurately measure concentrations, ensuring timely detection of hazardous substances in environments Versatile Applications: Ideal for environmental, industrial checks, and home air, providing reliability detection in labs, factories, and residential spaces 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 Compact & Lightweight Design: Measures only 20.4x32.4mm, making it easy to integrate into environmental systems, industrial setups, and smart home devices, Manufacturer: PANGBOER