Disclosed herein is an anti-fingerprint coating composition, a coating composition for forming thin films that prevents fingerprints adhered to displays or touch panels from being remarkably visible and exhibits superior durability and slip properties, and a method for preparing the same. The method comprises timely detection of a double-stranded nucleic acid fragment formed during the polymerase extension reaction due to a specific base sequence of the target nucleic acid fragment as increase of an electrochemical response under the existence of an electrochemically active intercalator; and the kit utilizes the method. The packaging configuration also includes a processor assembly configured for insertion into the main chassis. Also, the apparatus includes laser sources, a focussing optical system, and a combining optical system. Particularly, an air gap can be formed on the closed adhered surface of the optical plate and the diffusing plate.