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Method of test Reference should be made to the relative test procedure, in general as follows: Check suitable needle is fitted Clamp test panel to slide Load needle arm with weights to determine threshold of failure,progressively increasing load until failure occurs. Actuate slide,If failure occurs, needle on voltmeter will flick over. Only conductive metallic panels will be suitable for this test result Remove panel for visual assessment of scratch. ECCA Metal Marking Resistance test is a procedure designed to evaluate the resistance to a smooth organic coating when rubbed by a metallic object.