***** **********Best Quality Guranteed. *****Post mounted head rotates 180 and is adjustable for various working distance*****Left eyepiece diopter focusing adjustment; Eye shields for use on eyepieces too reduce ambient light*****3 way, built-in illumination system allows transmitted (bottom), incident (top) or dual lighting*****Slip-clutch focusing system protects against over-focusing with tension adjustment*****Objectives are parfocaled, parcentered andachromatic; Magnification changed by rotation objectives turret 90 to positive click stops