I can often offer the microplate accessory for the LS50B but at the time of writing I have run out. These microplate accessories are a bit of a pain. There are two pairs of rails that allow for X Y travel. They must be kept perfectly clean. The motors that drive the X Y motion work but have limited torque. With this downside aside, they are actually pretty neat. As I was saying in the LS50B description, this accessory might be very useful for you if you want to develop microplate fluorometer methods. Microplate fluorometers can be great but they are filter based instruments and lack flexibility. Having the ability to use monochromators to develop a filter fluorometer based method might really cut downdesign time.