The Testex Gauge is an essential tool used to measure the surface profile of a substrate, particularly in the coating and painting industry. It is commonly used to ensure that surfaces have the correct roughness for proper adhesion of coatings, paints, and protective finishes. This tool is a popular choice among professionals due to its accuracy, ease of use, and the ability to provide immediate results, making it an indispensable part of surface preparation processes in various industries, including construction, automotive, marine, and industrial manufacturing.