When evaluating hyperbaric chambers, the most critical factor is the Maximum Operating Pressure (ATA). For mild hyperbaric therapy (mHBOT), chambers typically operate at 1.3 to 1.5 ATA, while clinical-grade units may reach 2.0 to 3.0 ATA. You must also verify the Oxygen Concentrator Purity, which should consistently deliver 93% ± 3% oxygen. Additionally, ensure the chamber utilizes medical-grade TPU or stainless steel materials depending on whether it is a soft-shell or hard-shell model, and check for internal/external dual pressure gauges for safety monitoring.