When procuring processing lines, buyers must prioritize Automation Level (PLC systems like Siemens or Allen-Bradley) to ensure operational efficiency. Key metrics include Throughput Capacity (kg/h or units/h), Power Consumption ratios, and Material Grade, where Food-grade Stainless Steel (SUS304 or SUS316L) is mandatory for food and chemical industries to prevent corrosion and contamination. Additionally, verify the Modular Design capability, which allows for future scaling or integration of new processing stages.