The Invacare Check O2 Plus Oxygen Analyzer is a single economical instrument that reports all the operating parameters necessary for performing oxygen concentrator checks. It is an efficient and cost-effective analyzer designed with technicians in mind. It checks oxygen concentration, flow rate and patient outlet pressure on any oxygen concentrator. What’s more, it requires no routine calibration, and there’s no fuel cell to replace. The Invacare Check O2 Plus Oxygen Analyzer is three analyzers rolled into one.