Abstract: An apparatus for testing compression and tension springs, comprising a base member having an anchor end with fixed means adjacent thereto to orient one end of a spring to be tested and an actuation end with movable means for orienting the other end of the spring, a pressure system including a fluid pressure cylinder connected to the movable means for effecting longitudinal movement thereof away from the anchor end means, valve means for establishing fluid pressure communication between a pressure source and the pressure cylinder and a pressure gauge responsive to such pressure fluid communication, shut-off valve means for limiting movement of the movable means, and other valve means for releasing pressure from the pressure system; and a method for the comparative testing and mating of springs into matched sets.