Selecting a high-quality oxygen regulator requires a focus on safety, precision, and material compatibility. For medical applications, ensure the regulator is FDA or CE certified and features a click-style flowmeter for precise dosage control (typically 0-15 LPM). For industrial use, prioritize heavy-duty brass construction to withstand high pressure and prevent oxidation. Always verify that the inlet connection (e.g., CGA 540 or CGA 870) matches your specific tank valve type to ensure a leak-proof seal.