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Don't just guess at the condition of your valve springs when you can test them quickly, accurately, and repeatably. This portable, battery-powered rig can test valve springs, clutch springs, pressure relief springs -- any coil spring up to 2" outside diameter. Backlit digital readout shows up to 4" of travel or up to 1,000 pounds of force in 0.1 pound increments. Peak hold feature simplifies use.