System 373 TRU Trinocular Microscopes allow the user to simultaneous view images on screen and through the eyepieces. These microscopes feature 10X super wide-field eyepieces that provide a magnification range of 7X to 45X with a working distance of nearly 8?. The microscopes are mounted on a boom stand that has a 10? x 10? die cast base (weighing 22.5 lbs.), a vertical column that is 19.5? in height, and a horizontal dual boom ball-bearing extension of 24?. Boom stand can be adjusted to virtually any vertical and horizontal angle to provide unlimited positioning. The scopes? sturdy, cast aluminum alloy housing rotates 360? in its focus mount. Dual graduated knobs on both sides of the head control the zoom adjustment. A dimmable 150W Fiber-Optic Illuminator with continuous annular ring light lets the operator regulate the exact amount of light desired.