Request a third-party inspection report focusing on the gear transmission system and the seeding precision rate, which should ideally be above 98%. Evaluate the ergonomic design, such as adjustable handle heights and non-slip grips, which reduce operator fatigue. For high-performance models, look for integrated fertilizer-seeding dual functions, which allow for simultaneous application, significantly increasing operational efficiency. Always request a sample to test the 'duckbill' or 'nozzle' strength to ensure it doesn't bend when hitting small stones.