PCWI Wet Sponge Pinhole Detector

PCWI Low Voltage Holiday Detector, popularly called a Thin Film Holiday Detector, Pinhole Tester, or Wet Sponge Tester, uses the Wet Sponge Method to detect pinholes or flaws in coatings of up to 20 mils thickness.


The PCWI Wet Sponge Tester is a Low Voltage Holiday Detector for locating pinholes in coatings. When testing for flaws in coatings under 20 mils thickness, it is recommended to use a Wet Sponge Porosity Detector. Also known as a Thin Film Holiday Detector, Low Voltage Holiday Detector, or Wet Sponge Holiday Detector, the PCWI Low Voltage holiday detector is light-weight, push-button operation, with a telescopic handle to reach those out-of-the-way sections of tanks, structural walls, or other coated surfaces. Every PCWI Wet Sponge Tester is supplied with a manufacturer’s certificate of calibration.


  • LED display of voltage
  • Internally-mounted 9v battery
  • Low battery condition LED indicator
  • Audible and visual fault alarms
  • Large probe head (230 x 40 mm) and wide sponge for faster tests
  • Telescopic handle extends to 1.2 m.
  • Earphone jack allows testing in noisy environments. (earphone not supplied)
  • Conformable to ASTM G62 – 07 Standard Test Methods for Holiday Detection in Pipeline Coatings;
    NACE RP0188-99 Discontinuity (Holiday) Testing Of Protective Coatings


  • Range: 1 – 500 microns
  • Operating temperature: 1 – +50 *C
  • Test Voltage: 9, 67.5, and 90 v
  • Telescopic probe length: 350 mm to 1.2 m
  • Power supply: 9V battery
Weight350 g
Dimensions210 × 75 × 35 mm

The PCWI Wet Sponge Pinhole Detector comes with:

  • Unit
  • Telescoping Handle
  • Sponge
  • Belt/Pocket Clip
  • 7m Earth Lead and Clip
  • Carrying Case
  • Instruction Manual
  • Certificate of Calibration

PCWI Wet Sponge Detector Datasheet