The Adjustable Preparer is suitable for the preparation of coating films on glass, steel, aluminum, wood and plastic plates. The preparation of coating film is the first step in the inspection of various coating films. The use of precision processing of the coating film cloth, can be adjusted through the micrometer to select the thickness of the coating film, but also a limited elimination of human error, has been under the same conditions of the wet and dry film test to get the best results, to improve product performance and quality of the purpose.