oxygen concentrator 3L, 5L, 6L, 8L, 10L/min with large LCD, Realtime oxygen concentration ... diagnos Professional manufacturer of oxygen concentrator in Chinaoxygen concentrator 3L, 5L, 6L, 8L, 10L/min with large LCD, Oxygen Concentration Display ... (MPa)0.05-0.08Sound Level (dBA)standard type:3, 5L/min,≤42customized type:6L/min,≤46,customized type:8L/min ...