When evaluating Red Kidney Beans, buyers should prioritize physical appearance, moisture content, and purity. High-quality beans should have a uniform deep red color, a smooth skin without wrinkles, and be free from mechanical damage or insect holes. The moisture content should ideally be between 12% and 15% to prevent mold during transit while ensuring the beans don't become too brittle. Additionally, check for purity levels of 98% or higher, ensuring minimal presence of foreign matter like stones or dust.