DeFelsko PosiTest LPD Complete Kit

DeFelsko PosiTest LPD Low Voltage Pinhole Detector uses a wet sponge to detect holidays, pinholes, and other discontinuities on metal and concrete substrates without damaging the coating.


DeFelsko PosiTest LPD Low Voltage Pinhole Detector is used to locate discontinuities in coating systems, including pinholes, cracks, bubbles, or thin spots in cured coatings of up to 20 mils thick (500 µm). Porosity testing of thicker coatings is performed with a high-voltage tester, commonly referred to as holiday detector, porosity detector, spark tester, and sometimes a jeep tester.

Flaws in coating systems permit the intrusion of moisture or potentially corrosive substances that can degrade the substrate and cause early coatings failure. Detection of pinholes, cracks, bubbles, or weak spots enables the coatings contractor to take action to repair the coating before costly degradation or failures occur.

The PosiTest LPD Low Voltage Pinhole Detector can be used to detect holidays in coatings applied to any conductive substrate, including steel and concrete. Light-weight and easy to use, the new PosiTest LPD is available in a basic kit with the standard rectangular sponge, or a complete kit that also includes the hardware for a variety of test applications, including flat surfaces, internal pipes or tubes, and a roller brush option.


  • Lightweight, ergonomic design – the PosiTest LPD was specifically designed to fit comfortably in the hand with a balanced weight distribution
  • 4 voltage output options conform to international standards
  • Automatic self-test verifies voltage calibration
  • Regulated voltage outputs will not drop under load
  • GroundSense™ visibly reassures the user that the instrument is properly grounded
  • Audible and visible alerts when flaws are detected
  • Wide range of adaptable sponge hardware for testing a variety of applications
  • Common threads and connectors allow for use with existing paint roller extensions
  • Headphone jack with earbud for noisy environments
  • 3 AAA alkaline or rechargeable batteries
  • Weatherproof, dustproof and shockproof – meets or exceeds IP65
  • Conforms to international standards including: ISO, ASTM, NACE
  • Long Form Certificate of Calibration included

Stone Tucker Instruments is able to certify your PosiTest LPD Low Voltage Porosity Detectors.


PosiTest LPD Basic Kit comes complete with:

  • PosiTest LPD Low Voltage Porosity Detector
  • Base Tube
  • 3 AAA Batteries
  • Rectangle Sponge Hardware and Sponge
  • 15′ (4.5m) Ground Wire
  • Insulating Collar
  • Earbud
  • Wrist Strap & Carabiner
  • Long-Form Certificate of Calibration traceable to NIST
  • Hardshell Carrying Case
  • Instructions
  • 2-year Manufacturer’s Warranty

PosiTest LPD Complete Kit includes everything contained in the Basic Kit plus:

Adaptable Sponge Hardware:

  • Rectangle
  • Roller
  • Internal diameter
  • 8 x 8″ (20 x 20 cm) sponge sheet to cut custom sponge sizes
  • Wetting agent

Extension Accessories:

  • Extension rods provide additional 0.6 m (2′) of reach
  • Universal adapters to extend existing paint rollers and poles
  • 12 m (40′) ground wire
  • 4.5 m (15′) hot wire
  • magnetic grounding post

PosiTest LPD Accessory Pack can be purchased separately to convert the Basic Kit to a Complete Kit.

PosiTest LPD Cabled Wand features a 5.3″ (13.5 cm) handle with a 5′ hot wire cable, to enable the coatings inspector to test for pinholes in hart-to-reach areas. The PosiTest LPD Cabled Wand is compatible with the rectangular and roller sponge hardware for the PosiTest LPD Basic and Complete kits. The Cabled Wand is sold separately as an accessory to either kit.

Optional Accessories also include:  

  • PosiTest LPD Cabled Wand – converts the PosiTest LPD Low Voltage Pinhole Detector into a cable-wand unit
  • PosiTest LPD base rod for an additional 0.3m (1′) length – purchased individually; multiple extension rods can be connected to extend reach
  • 8 x 8 ” (20 x 20 cm) sponge sheets to cut additional or custom sponge sizes/shapes
  • Wetting Agent – 60 ml bottle*

*Why use wetting agent? Pinholes can be tiny enough to impair the passage of water to the substrate; a particular problems with thicker coatings. Using a surfactant or wetting agent reduces the surface tension of the water, improving the penetrability of the solution through the pinhole.

PosiTest LPD Datasheet