AmScope 3.5X-45X Simul-Focal Stereo Lockable Zoom Microscope on Dual Arm Boom Stand Simul-focal trinocular stereo microscope simultaneously views clear images through trinocular port and eyepieces 3.5X-45X super widefield stereo zoom magnification power 2-1/2" super widefield view and 8" working distance 3D boom stand allows point microscope head in any direction desired