Product Dexcription Features 【Fitment】 Universal tester use on 0-300LB, 5LB Increments Valve Springs. 【Quality Tools】 Precision tool for the professional & normal Users. valve spring testers allow you to evaluate your valve springs with a high degree of accuracy. 【Function】 Valve spring pressure tester is an invaluable tool for you to restore old engines, build new ones, or tear them down between rounds. 【Mini Version】 .