Mark 15 Sextant#026This model has many great features including seven large sunshades, a 3 mm x 27 mm star scope, and easy-to-read micrometer drum vernier scale that reads to 2/10 of a minute. The Mark 15 has a 7″ (18 cm) frame radius graduated from 120 to -5 and comes with a traditional half-silvered mirror.Comes with instruction booklet.