Can detect the oxygen (O2 ) content 
Measuring range: 0～25%(VOL) (the unit of volume size)

Applications:
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)