Which tools are essential for Liquid Penetrant Testing?

The correct choice highlights the essential tools used in Liquid Penetrant Testing (PT), specifically focusing on the application and inspection phases of the method. Spray applicators are crucial as they allow for an even and controlled application of the penetrant onto the test surface, ensuring that the material can effectively seep into any potential defects. The use of UV light sources is equally important since it facilitates the detection of the penetrant, which fluoresces under ultraviolet light, making any flaws visible.

In contrast, the other tools listed do not serve a direct purpose in the Liquid Penetrant Testing process. Hammers and chisels are not relevant, as they pertain to mechanical work or surface preparation rather than testing. While computers and software can aid in recording and analyzing results, they are not fundamental tools in the hands-on application of the liquid penetrant method itself. Visual inspection tools alone, while part of the broader nondestructive testing toolkit, do not encompass the specific requirements for liquid penetrant procedures, which necessitate both the application of penetrant and the use of specific lighting to reveal defects.