4. The oxygen monitor has audio and visual alarm, you can set audio alarm decibel that can give you a obvious prompt. 3. With a large LCD screen display the measured results, you can get oxygen concentration and temperature at a glance. 1. Adopting electrochemical sensor, which gives a quick and accurate measurement. 2. This multifunctional Rechargeable oxygen detector also can measure temperature. 5. Portable and handheld, easy to operate and carry. Widely used in chemical industry, electronic industry, underground operations, in-car oxygen detection., Weight: 1.57740748461 pounds, Manufacturer: Tuidzljd