Microscope World Blog: How to Calculate Stereo Microscope Magnification
OM4413 Dual Power 10X / 30X Stereo Microscope by Omano
Accu-Scope 3072 Dual Magnification Stereo Microscope Series – Microscope Central
Amazon.com: Vision Scientific VMS0002-RC-234 Binocular Stereo Microscope,10x Widefield Eyepiece,2X,3X and 4X Objectives,20x,30x and 40x Magnification, Top and Bottom LED Illumination, Rechargeable Battery : Toys & Games