Check the listing for details. bausch lomb stereo microscope Stereo Zoom 7 W Working Light Source. Condition: Used, Made in China. Listed at 297.50 USD. These were sold to me as "working when removed from service" that is how I sell them now. I tested the light which works great, even the dimming options. The scopes dials all work and it moves as it should, but that is all I know or can test. Things adjust when dials and knobs turn, the locking screw works. That is all I know. Their external components are clean, they are used with scratches and scuffs.