What are the specs for an AC adapter that will work with the #44348/44345/44340 Microscopes?

The microscope needs 5-6V DC, 200-1000mA tip positive electrical input. The jack should be 5.5 mm OD, 2.1 mm ID and approximately 12.5 mm long. If the jack is loose or too tight that it won't insert, you will need to split the central male pin to spread slightly or to press together for better electrical contact.

Updated 12/17/13