The NRC oxygen analyzer is equipped with an electro-chemical sensor and micro controller to measure oxygen concentrations of 0-99 percent. The NRC 02 Analyzer is the perfect oxygen analyzer for daily use by divers or dive stores. The sensor has a lifespan of approximately 2-years and can then be replaced. Compact size and low weight make this perfect travel for ambitious scuba divers who set value on precise oxygen analysis. The analyzer is constantly ready to function and indicates the value on a two-digit display.