Davidson Optronics Model D638 Coordinate Autocollimator with Built in Adjustable Mounting Base. Heavy duty. Weight: 22 lbs. D638 can be used as a two-axis autocollimator since the ocular micrometer may be rotated through exactly 90deg at either end of its excursion. It will read in azimuth or elevation. This instrument has a dark-field reticle and an illuminated concentric rings. All readouts are taken directly from the filar readout drums. Specs:
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