Specifications Continuous Zoom: 0.7X-4.5X Long Working Distance: 95mm-300mm / 3.7''-11.8'' Model: Jewelry Microscope Stand Material: Hard Aluminum Alloy Bracket Hole: 85mm / 3.35'' Control High Range: 60mm / 2.36'' Straight: ±15° Main Straight: 270° Machine Objective Lens: 0. X/165 mm Machine Eyepiece: WF10X/20 mm Binocular Pupil Distance: Pupil distance adjustment 54-76 mm (2.13-2.99 inch) Field of View: 5.1-33 mm (0.2-1.3 inch) Product Size: 68.58 cm x 53.34 cm (L x H)/27'' x 21'' Total Magnifation:7X-45X Package Content 1 x Micro Inlaid Mirror with Spring Bracket