This Ernst Leitz monocular microscope has two revolving objectives. It has a very complex optical condenser. Also, a coarse screw in the optical tube and a single vertical micrometer, located on the vertical support axis. Stand on tripod raised.It is a rare model. It was also made in Germany by Carl Zeiss in 1891 and in France by Maurice Stiassnie in 1900. Leitz’s previous model with a simple condenser was made in 1890.Español