Suspend three pendulums at one time with this specially designed pendulum clamp. Its rigid support arm is screwed to a rod clamp to assure perpendicular rigidity and stability throughout your experiments. You can be assured that your pendulum recordings are the result of your experiment and not a wobbly clamp! Each pendulum holder has its own knurled thumbscrew and locking device for easy adjustments independent of other pendulums. The clamp measures 28 cm in length.