The Rapidox 2100 & 3100 oxygen analyzers allow for fast and accurate analysis of oxygen gas from under 1 ppm all the way up to 100 percent volume. These units were designed for a variety of applications from gas purity to vacuum leak detection. Each unit comes complete with software for data logging and offers comprehensive facilities normally found on more expensive models. The units are easy to use and simple to calibrate using any two oxygen concentrations in the range of the analyzer. The display and outputs are all user programmable.