What is visual testing (VT)?

Visual testing (VT) is fundamentally an inspection method that relies on the human eye or optical instruments to assess the condition and integrity of components and materials. This method involves examining parts, surfaces, and features for defects or inconsistencies that could affect functionality or safety, such as cracks, corrosion, or incorrect assembly.

Visual testing is widely used across various industries, including manufacturing, construction, and maintenance, due to its simplicity, low cost, and immediate results. It serves as an initial screening technique before employing more advanced methods, allowing inspectors to quickly identify areas of concern that may require further, more detailed examination.

The other options describe different inspection techniques that involve specific technologies or equipment (like lasers, physical measurement tools, or thermal imaging), which are not what visual testing encompasses. Therefore, while they are useful methods for inspecting materials and components, they fall outside the definition of visual testing.