1. Adopting electrochemical sensor, which gives a quick and accurate measurement. 2. This multifunctional Rechargeable oxygen detector also can measure temperature. 3. With a large LCD screen display the measured results, you can get oxygen concentration and temperature at a glance. 4. The oxygen monitor has audio and visual alarm, you can set audio alarm decibel that can give you a obvious prompt. 5. Portable and handheld, easy to operate and carry. Widely used in chemical industry, electronic industry, underground operations, in-car oxygen detection. Description: Gas detectors can be used to detect combustible, and gases, and oxygen depletion, etc. This oxygen detector is widely used in industry and can be found in locations, such as on oil rigs, to monitor manufacture processes and emerging technologies such as photovoltaic. They may also be used in firefighting. Type:AR8100 Gas Type:Oxygen Measuring range:0-25% Resolution:5ppm Basic error:Less than 1.5% full scale Temperature range:-10-50 The principle of sensor: Electrochemical type, life for 2 years Display:LCD Alarm mode:Acoustic and light Battery:3.7V rechargeable lithium battery Operating time: 90h (continue working) Operation temperature:-10-50 Weight:743g/26.2oz Colour:As Shown Material:plastic Package Contents: 1 * Oxygen Detector 1 * USB Data Cable 1 * English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.