FWL- 9000 POL/PETRO Series scientific research polarizing microscopes have been specially designed for laboratory and scientific research work and university education, the microscopes combine with practical, easy operation and superior optical system, can be used for single polarization, orthogonal polarization, conoscopic light observation. They can provide reliable, high-resolution, high-contrast imaging. The microscopes can be used for multipurpose polarized light observation in fields such as geology, mineralogy and fossil fuel resource exploration.