1. High and low alarm points can be set, two-level alarm, the screen displays the alarm category, two-level triple alarm (sound, light, vibration), which is not easy to ignore
2. Sensor high concentration protection function
3. Provide real-time clock display function
4. Automatic calibration function to reduce measurement error
5. Power-on self-test function
6. Password management function, important operations require password verification, effectively preventing misoperation
