Testing

Claim 1

IN COMBINATION, A CASE, A REUSABLE TESTING MEMBER DISPOSED IN SAID CASE AND HAVING SPACED AND SIMULTANEOUSLY FULLY EXPOSED ZONES, ONE OF SAID ZONES BEING PROVIDED WITH NORMALLY INVISIBLE INDICIA CAPABLE OF BEING RENDERED VISIBLE BY A PRE-ESTABLISHED TREATMENT APPLIED TO SAID ONE ZONE AND INVISIBLE AFTER SAID TREATMENT, SAID OTHER ZONE BEING PROVIDED WITH PERMANENT VISIBLE INDICIA CORRELATED WITH SAID INVISIBLE INDICIA, SAID CASE BEING PROVIDED WITH OPENINGS DEFINING SAID ZONES TO PERMIT SIMULTANEOUS FULL VIEWING THEREOF AND HAVING AN EXPOSED AREA ADAPTED TO RECEIVE INDICIA OF A POSSIBLE LIKE CHARACTER AS THE INVISIBLE INDICIA, AND TREATMENT APPLYING MEANS DISPOSED WITHIN SAID CASE AND OPERABLE FOR APPLYING SAID TREATMENT TO SAID ONE ZONE TO RENDER SAID INVISIBLE INDICIA VISIBLE FOR COMPARISON WITH INDICIA ON SAID AREA AND FOR TERMINATING SAID TREATMENT WHEREBY SAID INDICIA OF SAID ONE ZONE IS RENDERED INVISIBLE TO CONDITION SAID MEMBER FOR REUSE.