The Twist-on efocus Dummy Microscope is a look-alike, inexpensive replica of the Twist-on efocus Fluorescence Microscope Body that fits any Twist-on efocus Imaging Cannula. It is meant to be secured to the rodents head to habituate it to the feel and weight of a microscope before using the real microscope body. The Twist-on efocus Dummy Microscope has an M3 connector and can be connected to a CM3 optical patch cord.