PCWI Holiday Detectors are employed in the non-destructive detection and location of pinholes, holidays, bare spots or thin points in protective coatings applied for corrosion protection over metal or concrete (conductive) surfaces. PCWI Holiday Detectors are suitable for production pipeline coating operations, tank work and structures. Holiday Detector is also known as a porosity detector, pinhole tester, spark tester, jeep tester or jeeper.