Hand-held oxygen (O2) analyzer
Model C-5 Neutronics

The Ntron Model C-5 is a battery powered, handheld oxygen analyzer with internal pump that can quickly provide analysis of 0-25% oxygen with 0.1% resolution. Rugged and compact enough to be carried in a briefcase or toolbox, the versatile, inexpensive C-5 is equally suited on the production floor, in research labs, or for tuning combustion processes.

Fuel Cell Oxygen Sensor Technology
The C-5 oxygen sensor is a small diffusion limited, fuel cell that converts oxygen concentration by volume directly into low level electrical current. Using a capillary as the diffusion interface provides for a sturdier sensor with better temperature and pressure coefficients than membrane type oxygen cells. The size of a "C" cell flashlight battery, the C-5 oxygen sensor is inexpensive, disposable, and unaffected by most background gases.