A cross-cut tester is a specialized tool used in the field of materials testing, particularly for assessing the adhesion and durability of coatings. It works by making a series of cuts in a coated surface, forming a grid pattern. This allows testers to evaluate how well the coating adheres to the substrate by measuring the amount of coating that remains after the cuts are made. These testers are commonly used in industries such as automotive, aerospace, and construction, where the quality of coatings is crucial. The results help manufacturers ensure that their products meet industry standards and perform reliably in various conditions.