Features Convenient Operation: Light and novel appearance, easy to carry, simple operation, menu operation interface, real-time display of battery power.10~+50℃ Oxygen Gas Detector. Safe and Reliable: Sound and light vibration alarm, there are essential safety instruments, which can continuously detect the oxygen concentration in the working environment. Please Use It with Care: the window and filter of the sensor must be kept clean. If the sensor window is blocked or filtered by a water film, it may cause readings to be lower than the actual gas concentration. Wide Range of Applications: Widely used in metallurgy, power plants, chemicals, mines, tunnels, underground pipelines and other places to effectively prevent hypoxia and oxygen poisoning. Note: Improper operation or use environment may affect the operational performance of the instrument. For the safest and most efficient use of the instrument, please read the details for proper operating procedures and safety. Specification: Model: 803 Sensor: Electrochemical Principle Detection Gas: Oxygen O2 Temperature Measurement: Ambient Temperature Display Unit: O2: %VOL Temperature: ℃/℉ Range: O2: 0~25%VOL Temperature: -15~50℃ Resolution: O2: 0.1% VOL Temperature: 0.1℃-0.1℉ Response Time: T90 Less Than 15s Alarm: sound and light alarm Alarm Point: low alarm point 19.5%VOL High alarm point 23.5%VOL Battery Type: 3 * AAA/7 alkaline batteries(not included) Operating Temperature: -10~+50℃ Operation Humidity: 15%-95%RH(no condensation) Weight: Approx. 176g / 6.2oz Package List: 1 * Oxygen Gas Detector Note: 1. Tho replacement of batteries, maintenance parts and other operations can only be carried out in a safe environment. 2. In order to ensure the safety and the proper use of the instrument, the operation and maintenance of the instrument can only be carried out by qualified personnel. 3. Every day before use please check the accuracy of the instrument in the fresh air, ensure that the measurement error is within the allowable range. If it exceeds the allowable error range, the instrument must be calibrated. 4. Keep the alarm through the mouth dean, no foreign objects clogging, otherwise it will lead to not hear the alarm or alarm information identification. 5. Removing and replacing the battery must be performed in a known, no hazardous environment. Package List