Description: 1. The portable oxygen detector is a kind of essential safety instrument which can continuously detect the oxygen concentration in the working environment. 2. It is suitable for explosion-proof, toxic leakage, underground pipelines or underground mines and other places, can effectively ensure the safety of the staff's is not infringed, the production equipment is not lost. 3. This instrument is a natural diffusion method for detecting concentration, using electrochemical , with sensitivity and repeatability.The instrument adopts embedded micro control technology, simple operation, complete functions, high reliability. 4. This O2 detector is applicable to the concentration of oxygen in the ambient air detection, are widely used in metallurgy, plant, chemical, mine, tunnel, underground pipelines and other places, effective of hypoxia and oxygen poisoning. Features: Appearance of light and novel, easy to carry, easy to operate. Menu operation interface, real display. Under voltage, low voltage automatic shutdown. Rapid response and reliable accuracy. Sound, light and alarm. Specification: Electrochemical Principle Test Gases: Oxygen Concentration (O2) Temperature Measurement: Ambient Temperature Display Unit: O2: %VOL Temperature: / Measurement : O2: 0 25%VOL Temperature: -1550 / 5122 Resolution: O2: 0.1%VOL Temperature: 0.1 / 0.1 Accuracy: O2: 3.0% Temperature: 1.5 Response : <15s Alarm: Sound and light alarm Alarm Point: low alarm point 19.5%VOL,high alarm point 23.5%VOL Type: 3.7V Lithium Battery (1000mA) 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. 175g Package Size: Approx. 22.5 * 11.1 * 5.5cm / 8.9 * 4.4 * 2.2in (L * W * H) Package List: 1 * O2 Detector 1 * User Manual