This model has many great features like the "top of the line" Mark 25 including:

• 7 large sunshades
• 3 X 27 star scope
• Easy reading micrometer drum
• Vernier scale that reads to 2/10s of a degree
• 7" frame radius graduated from 120 degrees to -5 degrees

The Mark 15 comes with a "traditional" half-silvered mirror. All Davis Sextants come with instruction booklets.