The 8" antique reproduction sextant has six filters, a scale magnifier, and a slow-motion control with vernier readout. The sextant measures 10.5"H, 10.5"W, 4.75" deep, and weighs 5 lbs. Any of the sextant's six filters can be swung into position. A powerful magnifier can be moved to assist in reading the vernier scale. The sextant is beautifully made of solid brass with a German Silver scale. The sextant's telescope produces a bright and clear image. The index mirror can be adjusted using two knurled brass screws. The angle on the vernier scale is set to 0 degrees and the index mirror is adjusted so that the images from both optical paths as viewed through the telescope align to produce one image. This sextant is fully functional, but not intended for navigation. The back of the sextant has a hardwood handle. The sextant comes with a sheesham display box. The box is velvet lined and inlayed with solid brass. The 8" sextant and box make excellent awards and gifts.