U-SDO3-1-7 Side by side dual-observation attachment with integrated movable LED arrow pointer. Pointer is controllable by main observer. Color of pointer selectable between green and red. Compatible with BX41, BX43, BX45, BX46, BX51, BX53 & BX61 microscope frames, including AC adaptor and support stand, mounts only on the right side of the microscope.