When sourcing fly trap machines, prioritize the attraction mechanism and capture efficiency. For UV-based models, ensure the use of 365nm wavelength LED or fluorescent bulbs, as this spectrum is most effective for attracting Diptera. For indoor food-service environments, glue board traps are mandatory to prevent insect fragmentation, whereas electric zappers are suitable for industrial warehouses. Verify the effective coverage area (typically measured in square meters) and ensure the housing material is made of fire-retardant ABS plastic or corrosion-resistant stainless steel for longevity.