1. Supplier Qualifications and Reputation:Choose suppliers with strong capabilities, good reputation, and complete qualifications. Prioritize brand agents, manufacturers, or high-rated and well-reviewed platform merchants. For instance, Systech usually looks for its authorized dealers.

　　Service:Oxygen probes are consumables (especially zirconia probes for high-temperature applications), with a limited lifespan (usually ranging from 1 year to several years). It's crucial to inquire about the warranty period, technical support, and the ease of purchasing replacement parts (such as the probe itself, reference air filters, and even connection cables). Good quality replacements can significantly extend the equipment's lifespan.