When evaluating a car suspension tester, prioritize the EUSAMA (European Shock Absorber Manufacturer Association) measurement principle, which is the global standard for road adhesion testing. Ensure the equipment supports a maximum axle load of at least 2,500kg to 3,000kg to cover passenger cars and light commercial vehicles. Look for a frequency range of 0-25Hz to accurately simulate road conditions and verify that the measurement accuracy is within ±1%. Additionally, high-quality units should feature galvanized or anti-slip treated test plates to prevent tire slippage during high-frequency vibration.