The Davidson Optronics D-212 Adjustable instrument stand is designed to hold instruments with a 1.500 inch diameter barrel, such as the D-657 Tooling Autocollimator, , the D-658 Electronic Signal Autocollimator, and the D-691 Laser Alignment Autocollimator. Made of fine-grain cast iron, and precision ground, this stand can be adjusted for +/- 4 degrees of elevation, and 3 degrees of azimuth.