Colorful, Portable, and LCD screen Testing the purity of oxygen concentrator and useful in othe situations for monitoring Oxy. specification:1,accuracy:+-3%2, Max. Pressure: 138Pa3, Max. Flow: 15LPM4, Low battery voltage reminding5, Power off automatically in 15mins without single6, LCD purity display, between 21.0%~99.9% YAY-120 15L/min Max. Flow Portable Oxygen Analyzer,