Unboxing of AmScope SE400 10X Binocular Stereo Microscope on Boom Arm Stand LED Goose Neck LightThe solid-cross block and brass inserts, as well as the precise, lightweight, rail assembly improve mobility and give a smooth and fluid horizontal movement. Parco scientific 7x45x binocular zoom stereo microscope, gliding arm boom stand precise, heavy-duty rack and pinion focusing mechanism, with large knobs and adjustable tension control.