Buyers must prioritize sensor accuracy (typically ±2% within the 70%-100% range) and LED wavelength stability. Ensure the probe uses high-quality medical-grade silicone or TPU materials that are biocompatible and non-irritating to the skin. For reusable probes, verify the cable durability, specifically looking for Kevlar-reinforced wiring to prevent internal breakage during frequent use. Additionally, confirm the connector type (e.g., DB9, 6-pin, or 12-pin) to ensure seamless compatibility with specific patient monitor brands like Mindray, Masimo, or Nellcor.