1. An adjunct device and system for use with an existing diagnostic object or body imaging device, said adjunct device comprising: a) means for providing comparative images to directly compare on a single display an image of an object or body obtained from the imaging device and one or more library stored images from the same type of imaging device of a corresponding object or body having probable conditions as the object or body being imaged, the probable conditions being determined either by the user or by a computerized comparison of the image to the library stored images falling within preset comparison parameters; whereby a probable diagnosis of an actual condition of the object or body can be formulated by a matching comparison; b) means for providing a weighted probability for a particular diagnosis being relevant to said condition, said weighted probability being based on library stored general parameters and optionally in further view of the prior history of the body or object; c) means for providing a weighted probability for a particular mistake being relevant to the condition and image based on library stored general parameters and optionally in further view of the prior history of the body or object and present image on the screen; d) means for providing to the user, if relevant, which additional test or tests are required to increase the probability of relevance of a probable diagnosis; e) means for providing to the user a case and situation oriented need for follow-up and/or monitoring of conditions; and f) means for providing to the user, information regarding treatment or repair protocols, as relevant to the body or object, for a diagnosis with a probability above a pre-set probability level.