Nikon Drawing Tube accessory, which attaches between the microscope arm and the eyepiece tube. It provides a bright superimposed image of the specimen on a drawing board or XY coordinate digitizing pad for computerized image analysis studies. Mounted on either side of the microscope. This attachment will fit the Nikon Alphaphot, Labophot, and Optiphot series of microscopes. It has a magnification factor of 1.25X built into the unit with a magnification zoom range of 8.5X to 16X with controls for focus, zoom magnification and 3-position turret. The condition of this unit is pristine optically, cosmetically and mechanically. The Nikon product number is 79185 with a last list price of $1,015.00! These units are rare.