When evaluating automatic hand basins, prioritize sensor technology, specifically Infrared (IR) sensors with an adjustable sensing range (typically 5-15cm) to prevent accidental triggering. The solenoid valve should be rated for at least 500,000 cycles to ensure long-term durability. For the basin itself, look for Grade A vitreous china or 304-grade stainless steel to ensure resistance to corrosion and staining. Additionally, verify the IP65 waterproof rating for the electronic control box to protect against moisture in humid bathroom environments.