Specifications: Model: H850Set and see, no special knowledge neededZoom ratio 1:6.3Diopter regulator on both eyepiecesHigh quality optical glass elementsWork with a boom stand or regular stand with Φ 76mm mount sizeOffers crisp sharp, high resolution imagesMicroscope Head:45 degrees inclined 360 degrees rotatable binocular headSharp stereo erect images over a super wide field viewAdjustable interpupillary distance 50 - 70 mm to fit anyone's eyesInterpupillary distance: 50~70mmBody mounting ring size: Φ 76mm Magnifications and Objectives: Total magnifications: 12X~75XEyepieces: wide field 15X with 16mm field of viewObjectives: zoom 0.8X ~ 5XWorking distance: 115mmField of view: 19.5mm at 12X magnification, 3.5mm at 75X magnification Size and Weight: Dimensions: 7-1/4 " x 7-1/8" x 8-3/16" (18.5cm x 18cm x 20.8cm)Net weight: 3lb 6oz (1.53kg) Packing List: Binocular stereo microscope body A pair of wide field eyepieces WF15X/16