These zoom stereo microscopes on single-arm boom stand provides crystal clear sharp clear images. The base model comes with a 7X-45X binocular head with 10X super widefield eyepieces and a sturdy single-arm boom stand. The zoom magnification power can be extended from 3.5X to 225X depending on the choice of the optional eyepieces and Barlow lenses. https://www.amscope.com