The Model O2Tracer is simple to use, accurate and very economical when measuring Oxygen at % levels. One User specific measuring range the unit will offer with different ranges between 0 – 100% of oxygen. Typical range is 0- 25%. The O2Tracer uses a special fuel cell to measure the oxygen concentration. The sensor meets the industrial requirements for accuracy, sensitivity, easy to use and operating life. The calibration of the instrument for % oxygen measurements in gas should be done with a calibration gas or on air.