AmScope SM-4BZ-30WY 3.5X-90X Zoom Stereo Microscope on Dual-Arm Boom Stand with Dual-Arm LED Fiber Optic Light 3.5X-90X very large zoom magnification power with crisp sharp images 2-1/2" (65mm) SUPER widefield of view and 8" (200mm) working distance 3D boom stand allowing to point microscope head in any direction desired Powerful 30W LED fiber-optic illumination Auto-shut-off for electricity safety and color filter slot ready