The 5L oxygen concentrator is a medical grade device that can deliver supplemental oxygen to those who cannot get enough oxygen on their own. It can treat patients with COPD, pulmonary fibrosis, and other hypoxia-associated conditions efficiently and comfortably. It’s always nice for an oxygen concentrator user to know his/her blood pressure and heart condition. Smart Blood Pressure Monitor with ECG is an amazing tool to let you check your BP and take an ECG with a single device.