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, can effectively ensure the safety of the staff 39;s life is not infringed, the production equipment is not lost. This instrument is a natural diffusion method for detecting gas concentration, using high performance electrochemical sensor, with excellent sensitivity and excellent repeatability.The instrument adopts embedded micro control technology, simple operation, complete functions, high reliability. This O2 detector is applicable to the concentration of oxygen in the ambient air detection, are widely used in metallurgy, power plant, chemical, mine, tunnel, underground pipelines and other places, effective prevention of hypoxia and oxygen poisoning.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 PrincipleTest Gases: Oxygen Concentration (O2)Temperature Measurement: Ambient Temperature Display Unit: O2: %VOL Temperature: / Measurement Range: O2: 0 25%VOL Temperature: -1550 / 5122 Resolution: O2: 0.1%VOL Temperature: 0.1 / 0.1Accuracy: O2: 3.0%FS Temperature: 1.5Response Time: T90Alarm: Sound and light vibration alarm Alarm Point: low alarm point 19.5%VOL high alarm point 23.5%VOL Battery Type: 3 * AAA 1.5V Alkaline Batteries (NOT Included)Operating Temperature: -1550 / 5122 Operation Humidity: 15%95%RH (non condensation)Item Size: Approx. 12 * 6.5 * 2.5cm / 4.7 * 2.5 * 1.0in (L * W * H)Item Weight: Approx. 107.1g / 3.8ozPackage Size: Approx. 22.5 * 11.1 * 5.5cm / 8.9 * 4.4 * 2.2in (L * W * H)Package Weight: Approx. 182g / 6.4ozPackage List:1 * O2 Detector1 * User Manual