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The sign accompanying the Laser Ranging Retroreflector Experiment.

It reads

Laser Ranging Reflector Experiment

These sophisticated mirrors were placed on the lunar surface during the Apollo 11, Apollo 14, and Apollo 15 missions. They are designed to reflect a laser light beam precisely back in the direction from which it came, no matter what the angle.

Accurately timed laser pulses from various ground stations on Earth were bounced off the three reflectors to exactly determine lunar motion and rotation.

The accuracy of the previous measurements was improved a hundred-fold through the use of these experiments.

The qualification model displayed here was manufactured in Michigan by the Bendix Corporation.