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Magnification Ratio: 500x & UnderModel Number: Stereo Microscope Eyepiece GuardsFeatures: PORTABLETheory: Stereo MicroscopeDrawtube: Binocular&Trinocularltem: Stereo Microscope Eyepiece GuardsApplication: Eyepiece CupsSuitable: Binocular/Trinocular Stereo MicroscSuitable Diameter: 33-35MMFeature: FoldableFunction: Eyeshields, Eyepiece CoverPacking list:1 pair eyepiece guardsNotes:Transition: 1cm=10mm=0.39inchDue to manual measurement, please allow an error of 0-3mm. Please make sure you dont mind before bidding.Due to the differences between different monitors, the picture may not reflect the actual color of the item. Thank you!