The Luxo 18712 system 250-FL features a Binocular Stereo-Zoom Microscope with Boom Stand and a Fluorescent Ring Light. Luxo's Binocular S-Z scope has a sturdy, heavy duty, cast aluminum alloy housing that rotates 360° in its focus mount. Models are standard with 10X widefield eyepieces and have a zoom range from .65X to 4.5X giving it a magnification range of 6.5X-45X. The zoom control is by dual graduated knobs on the sides of the body. Its extended magnification range is from 3.25X to 225X when using optional eyepieces and accessory lenses. The Boom Stand has a 10" x 10" base that weights in at 22.5 pounds, has a vertical column that is 17.5" in height and a horizontal extension of 26". The 17-watt fluorescent light source is rated for more than 4,000 hours; its color temperature is 5600°K. It comes with a 2-conductor polarized plug-in ballast on an 8-ft. cord and provides excellent illumination.