The best video inspection systems for gems industry, microelectronics, biomedical, bio-chemical and departments zoom your view from 7x-180x. Four constituents of mechanical compensation structure are used to maximally ensure the quality of image. Zoom mode including: manual zoom, manual zoom with detents, dc motorized zoom or stepper motorized zoom, etc, in which, the main manual zoom position unit is needed for magnification, with the magnification as 0.68x, ix, 2x, 3x, 4x, 4.5x. The illumination optic axis is parallel with image optic axis, which is especially suitable for the observation of metallic phase, object with glisten and deep hole and also the Device has a polarized light system. Cross hair reticle can be set up in the microscope, which is the simplest way of shadow image measurement. Trinocular or binocular tube for compound microscope can be connected after installed with field lens in order to form a zoom toolmaker microscope.