AmScope 5X-10X-15X-20X Circuit Board Dental Lab Binocular Stereo Microscope with Flexible Boom Arm Stand + Light 5X, 10X, 15X 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)