Penetrant testing equipment is a non-destructive testing device that detects surface defects in metal parts and welded joints. It applies penetrant liquid to the object surface, uses capillary action to penetrate fine cracks, pinholes, and porosity surface opening defects, then visualizes defects using developer. Essential for quality control of automotive parts, aircraft components, pressure vessels, and piping, it includes inspection equipment supporting color check method and fluorescent penetrant testing, along with consumables such as penetrants, developers, and cleaners. Unlike ultrasonic testing or X-ray inspection, this is a surface defect-specific inspection method.