High Quality 2.5" Brass Chart Magnifier - Magnifying Glass This brand new high quality 2.5" brass magnifying glass is an excellent aid for reading maps and atlases as well as seeing other small details that you don't want to miss. Our brass magnifying glass is 2.5" tall and the glass is approximately 1.75" in diameter. It produces a clear image and comes with its own leather case. It produces a clear image and comes with its own leather case. Our chart magnifier is a practical and elegant gift and a nice addition to any collection.