Model GB300

Percent Portable Oxygen Analyzer​​​​


The hand-held GB 300 is designed for use in a wide variety of applications from diving to fine tuning boilers.​

Easy to use

This model incorporates a Micro-fuel Cell sensor for quick and accurate analysis of oxygen. It is maintenance-free, sealed, the electrochemical cell is specific to oxygen, is insensitive to flow rate and has a 90% response in less than 10 seconds. At the end of its life, the cell is discarded and replaced like a flashlight battery.


Since it is constructed of high impact resistant materials, it provides unparalleled performance under the harshest conditions. The unit is powered by 3 AA batteries which should last for at least 2,000 hours of use.


  • Detects oxygen with sealed, maintenance-free micro-fuel cell technology

    • ​Class I-17 sensor with 36-month expected life (with air exposure)

  • Range: 0-100% O2 with 0.1% O2 resolution

  • High-impact design for lightweight yet rugged electronics

  • Single button operation for power and air calibration

  • 2.5-digit display and battery indicator

  • Automatic diagnostics with error codes to simplify troubleshooting

  • 0-1V analog output (optional RS-232 digital output)

  • RFI-hardened design

  • Includes analyzer with three AA batteries, I-17 sensor and coiled sensor cable that extends to ten feet,​



​0-100% oxygen


​± 2% of FS at constant temperature and pressure

​Response Time

​90% of step change in less than 10 seconds


​32° to 104°F (0° to 40°C)


​3AA alkaline batteries

​Battery Life

Minimum 2,000 hours


​Type:     I-17
Life:       36 months in air
Cable:   Extends to 10 feet (3 m)


​1 lb. (420 gr.)


​5.5"H x 3.5"W x 3"D
(13.97 x 8.89 x 7.62 cm)


​0-1 VDC


​12 months covers defects in material and workmanship; excludes sensor life

​​Optional Items

​Interface cable:  0-1 VDC (PN B75554)



​File Size​

Model GB300 Brochure​


Model GB300 Declaration of Conformity​