1. Multi-function: A professional oxygen (O2) detection alarm is a special instrument for detecting oxygen concentration. It has a built-in sensitive gas sensor, which responds quickly and updates the detection data in real time. 2. Use: The key design, the oxygen detector is easy to use, easy to switch the detection mode, small and compact, easy to hold in the hand, natural and comfortable, very suitable for carrying and storage. 3. Flexible: With the backlit display and data retention function, the measurement value of the oxygen tester can be read at any time, which is convenient for recording and monitoring, and the calibration function ensures that the data has higher accuracy. 4. Safety: Alarm setting function and maximum maximum / minimum min mode, when abnormal gas concentration is detected, an alarm will be issued to remind people to evacuate to a safe area to ensure safety. 5. Application: With strong practicality and reliability, the oxygen detector can be widely used in household, chemical, mining, environmental protection, gas transmission and distribution, biochemical medicine, agricultural scientific research and other industries.