One knob design. Fully locking, unique tangent arm design altitude adjustment, 0-64 degrees, large knob for easy alignment. Laser engraved latitude scale in 2 degree increments. 8. 5 degrees. R.A. circle engraved for Northern and Southern Hemisphere.
Porter slip ring design.
7 lb counterweight. 11 lb and 21 lb. Through the axis polar scope, works in Northern and Southern hemisphere. Polar scope optional. Instrument weight capacity 30 lbs.