Suitable for office, school, warehouse, and agricultural plantings. No calibration required at startup; automatic monitoring ensures continuous operation. Sensor technology and accuracy: uses an air semiconductor sensor, a PM2.5 sensor, and an electrochemical sensor driven by a performance chip for precise detection. Accuracy can reach up to 1 PPM. Clear display and alerts: large digital screen with backlight for easy readability in various lighting. Supports an alarm function to notify when readings exceed set thresholds. Power and endurance: builtin 2000 mAh rechargeable battery with low power consumption for long endurance. Designed to minimize the need for frequent replacements. Practical use scenarios: Office or classroom: monitor indoor air quality continuously and receive immediate alerts to maintain a healthy environment. Warehouse or agricultural greenhouse: track PM2.5 and gasrelated readings to protect workers and optimize plant growing conditions. Industrial or campus facilities: unattended ambient monitoring with automatic alerts reduces manual checking and helps ensure compliance with safety standards.