When sourcing these tools, the most critical factor is the Lifting Capacity (Tonnage); ensure it matches or exceeds the Gross Vehicle Weight (GVW) of your target market's vehicles (typically 3-ton for sedans/SUVs and 5-ton for heavy trucks). You must also verify the Lifting Height Range, looking for a minimum of 155mm to 450mm to accommodate high-clearance vehicles. Additionally, prioritize units with a Built-in Safety Valve that prevents the jack from falling even if the power is disconnected, and check for Integrated Functions like an electric impact wrench or tire inflator pump to increase the product's market value.