Usage Tips: The portable oxygen detector is a kind of essential safety instrument which can continuously detect the oxygen concentration in the working environment.It is suitable for explosion-proof, toxic gas leakage, underground pipelines or underground mines and other places Features: Appearance of light and novel, easy to carry, easy to operate. Menu operation interface, battery power real time display. Under voltage, low voltage automatic shutdown. Rapid response and reliable accuracy. Sound, light and vibration alarm. Specification: Sensor: Electrochemical Principle Test Gases: Oxygen Concentration (O2) Temperature Measurement: Ambient Temperature Display Unit: O2: %VOL Temperature: ℃/℉ Measurement Range: O2: 0 ～ 25%VOL Temperature: -15～50℃ / 5～122℉ Resolution: O2: 0.1%VOL Temperature: 0.1℃ / 0.1℉ Accuracy: O2: ±3.0%FS Temperature: ±1.5℃ Response Time: T90