Features: Experience safety with multifunctional Oxygen Detectors, featuring high Precisions sensors for accurate and rapid oxygen level and gas concentration monitoring. for convenience, this device boasts display and user friendly, ensuring immediate understanding and adjustment of environmental data. for environmental enthusiasts, scientific researcher, and safety professional who demand consistent air quality and gas concentration. in application, for indoor air quality check in homes, schools, offices, as well as outdoor like camping and field research. Elevates your environmental awareness with Oxygen Detectors, for industrial, and mining sectors to maintain air safety standards. Specifications: Materials: Plastic, Electronic Component Size: 13.8x7.8x3.2cm Package Includes: 1PC Oxygen Detectors note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.