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The microscope is enclosed in a blackout environmental chamber with access ports for ease of access to the stage to be able to change stage inserts to suit different samples (slides, 35mm dishes, plates, etc.). There are LED strips inside to allow you to see the stage through the viewing port. Owing to the chamber both heat and CO2 control is available, the CO2 can be either 5% or 10% and is used with a special chamber (not all inserts will be compatable with this chamber).