The O.C. White TKSZ-L ProZoom 4.5 Stereo-Zoom Microscope with 7-45x Magnification Range, 10x Eyepieces, and Laboratory Style Base pairs durability and performance in a way that can only truly be appreciated when used. The TKSZ-L ProZoom 4.5 microscope offers both an excellent magnification performance as well as rugged dependability. It has a standard magnification range of 7-45x, which can be expanded to up to 225x using optional lenses. The ESD safe design of the microscope is by all metal construction. Many imported microscopes include plastic components, or topical ESD coatings that will degrade over time. The ProZoom 4.5 series, however, is ESD safe by construction, and will stay ESD safe over the life of the product.