Can detect the oxygen (O2 ) content Measuring range: 0～25%(VOL) (the unit of volume size) Oxygen content detecting in office and other working place Oxygen manufacturing workshop Petroleum refining and petrochemical plants Oxygen content detecting in trains and automobiles Oxygen content detecting in minerals Oxygen content detecting during mountain climbing and in sealed places Oxygen content detecting in cabin Intellectualized design and multiple functions; Highlight backlight display and acousto-optic alarming, easily configured; Low power symbol display Ergonomically case designed, beautiful outlook, nice operate feeling and easy to carry Resolution: 0.1 %VOL Measurement error: ±0.5% Power: 3×1.5V AAA battery Dimension: 172L×51W×26H(mm)