AmScope 7X-90X 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 7X-90X super widefield stereo zoom magnification power 1-1/4" super widefield view and 4" working distance 3D boom stand allows point microscope head in any direction desired