AmScope 10x-15x Stereo Binocular Microscope Boom Arm + Light 10X and 15X 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)