Adhesion testers are instruments used to measure the strength of the bond between two surfaces, such as paint and a substrate. They help determine how well a coating adheres to a material, which is crucial in industries like construction, automotive, and manufacturing. By applying a specific force, these testers can assess whether a coating will peel or chip under stress. There are various types of adhesion testers, including pull-off testers and cross-cut testers. Each type uses different methods to evaluate adhesion, providing valuable data for quality control and ensuring that products meet industry standards.