AmScope 10X-20X Widefield Binocular Inspection Stereo Microscope on Boom Arm Stand 10X and 20X Magnification Powers Versatile Boom-arm Stand Covering Large Working Area 9" Extremely Large Working Distance Erect Sharp Stereo Images over a SUPER Widefield of ViewAccurate Alignment Ensuring Fatigue-Free Long Time Viewing Adjustable Interpupillary Distance (50 mm - 77 mm)