X-ray goniometer, document angles on X-ray negatives, 180 deg head has two opposing scales marked in 2 1/2 deg increments, Black anodized aluminum with easy-to-read white radiopaque markings, size: 6 in
Universe II Laminated Placemat Chart, The poster sized chart is good fit for bulletin boards and walls, Illustrates major stages in the evolution of the universe starting with the Big Bang, Provides a summary of modern cosmology