Amazon.com: Compound trinocular Microscope, 40X-5000X Magnification, Digital Laboratory trinocular Compound LED Microscope with USB Camera and Mechanical Stage, WF10x and WF20x eyepieces, Abbe Condenser : Electronics
Anatomy of a Microscope - Substage Condensers | Olympus LS
ZEISS Microscopy Online Campus | Microscopy Basics | Practical Use