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Blue Small Oxygen Analyzer for Psa O2 Device Oxygen Purity Tester. Portable Design: Palm-sized, lightweight (146g excl. battery) for easy handling. 3-in-1 Functionality: Measures oxygen concentration, flow, and outlet pressure simultaneously. Wide Measurement Range: Oxygen purity 30-96%, Flow 0-10 L/min, Pressure 0-200kPa. Fast Response Time: Response time under 30 seconds for quick readings. Battery Powered: Operates on 9V alkaline battery for portability. CE Certified: Passed CE certification by TUV for quality assurance. 1-Year Warranty: Comes with a standard 1-year warranty coverage. Online Support: Provides online after-sales service for customer assistance.