Pro O2 Handheld Analyzer


The Nuvair Pro O2 Handheld Analyzer measures oxygen levels in mixed gases from 1% to 100% oxygen. It comes with a water- and impact-resistant case and is available in three power options: Wall plug-in, 9-volt or rechargeable lithium battery. The oxygen sensor and batteries are user-replaceable.


Easy-to-operate, extremely accurate and stable, the Nuvair Pro O2 is preferred by commercial, military, technical and advanced recreational divers using nitrox. Our water- and impact-resistant case is designed for everyday use in the marine environment. The Pro O2 is also popular with medical, welding, and other industries not related to diving.

To change the battery or sensor, simply remove four screws to have easy access to these user-changeable components. The Nuvair Pro O2 Analyzer can be placed in-line with your compressor during mixed-gas production or used as a standalone unit for testing mixed gas and nitrox individual scuba tanks or storage cylinders. We offer a wide range of accessories for adapting to compressors and diver BC (buoyancy compensator) power inflators. All Nuvair Pro O2 units are built and tested in-house, and are ready to use upon receipt.

Replacement Sensor

Sensor Replacement 9505

Power Options

  • 9-volt battery (SKU 9450-B)
  • Rechargeable lithium battery (SKU 9450-LB)
  • Wall plug-in (international) (SKU 9450-E)


Maximum Gas Flow Rate 0.5-2 L/min (~1 bar)
Display Accuracy ±1%
Sensor Type Electrochemical
Expected Cell Life 36 months in air at 25°C (77°F) and 50% rh
Range 0-100% oxygen
Response Time Response time <6 seconds for 90% of final value
Operating Temperature 32° to 104°F (0° to 40°C)
Storage Temperature 32° to 122°F (0° to 50°C)
Operating Humidity 0-100% rh, non-condensing
Power Wall Plug-in, 9-Volt battery or lithium ion option
(L x W x H)
4-1/8 x 2-1/2 x 1-3/4 in
(10.5 x 6.2 x 4.4 cm)
Weight 7 oz (200 g)
Warranty 0 – 12 months Free Replacement
13 – 18 months 50% Off Replacement
19 – 24 months 25% Off Replacement

WARNING: Never expose gas sensors to pressure or you may cause damage and/or false readings. Damaged sensors will not provide accurate gas analysis. Most gas analyzers can be used to analyze a regulated gas sample flow, the contents of a gas cylinder, or the flow from a regulator. The flow rate of gas must equal 1-5 L/min. To produce this flow, a Flow Restrictor and Regulator may be required. A faulty Flow Restrictor can lead to a false analyzer reading. Flow Restrictors should be regularly tested with a Flow Meter. Inaccurate gas analysis can lead to serious personal injury or death.