A microplate spectrophotometer from a company called BioTek, this was a ancient piece of equipment at work that I needed to see if we could make work with a pc so a student could use it. But we found during the time it was in storage (or when it went into storage) it was broken. But since it took me forever to find even this operator's manual, sharing it would be a good idea. Just in case someone else needs to try make one work.