APPARATUS FOR PHYSIOLOGICAL TESTS, NAMELY, TISSUE SPECTRUM ANALYZERS, APPARATUS FOR LIVER FUNCTION TESTS AND ENDOSCOPIC CATHETERS, APPARATUS FOR THERAPEUTIC USE, NAMELY, LASER SURGICAL SYSTEMS, COMPRISING A MICROCOMPUTER, LASER BEAM DISPLAYS, LASER TUBES, MIRRORS, SELF-CONTAINED CONSOLES, LIGHT GUIDE BALANCERS, LIGHT GUIDES, CONTROL PANELS, HAND PIECES, FOOT SWITCHES AND ALARM DISPLAYS, AND APPARATUS FOR SPECIMEN TESTS, NAMELY, BLOOD AND/OR URINE ANALYZERS