PoroTest-7 High Voltage Porosity Holiday Detector

Made in Germany
porotest 7 porosity holiday detector
Click images to enlarge.

3 high voltage probes for different coating thicknesses available (not included):

P7: 0.03 mm – 1.7 mm / 1 mils – 67 mils

P30: 0.52 mm – 9.49 mm / 20.5 mils – 373.6 mils

P35: 1.4 mm – 11.3 mm / 55 mils – 444 mils

Designed for detecting flaws and pores, the PoroTest 7 can be used for non-destructive porosity testing of all insulating coatings on conductive substrates such as steel, aluminium, etc. The test instrument consists of a high voltage probe with an integrated high voltage generator and a test electrode, which is simply connected to the probe. The test voltage control works automatically and is specific to the thickness of the material to be tested and vice versa.

The control unit features a digital display and control pad. The control unit housing is fully portable and made of rugged ABS plastic with an integrated handle. The high voltage probe and control unit are connected via a rugged cable. To detect porosity, the appropriate test voltage specific to the material thickness is set on the control unit which applies, when activated, a spark discharge at the moment a material flaw is detected. In addition to the spark discharge, flaws are indicated by a visible and audible signal and counted. The test voltage is directly indicated on the digital display.

Typical applications: Testing linings and coatings applied on ducts, pipes, hulls, oil and storage tanks, enamel, paint, rubber and bitumen linings, vessels and tanks, GFK and other plastic materials.


  • Powerful and versatile gauge with new ergonomic design making it ideal for on-site testing
  • User-friendly key-pad layout with menu driven operation
  • Variable pre-set test voltages specific to material thickness
  • High voltage probe with equipment-on and pore indicator (red LED)
  • Light-weight and hand-held test electrodes provide convenient operation
  • Test method conforms to DIN 55 670
  • Backlit display to indicate current test voltage, number of pores and material thickness
  • Residual voltage indicator
  • Alarm signal when exceeding pore limit setting (Limit)
  • Power supply: AC operated or battery operated via integrated storage battery (C-cells)
  • Electrical safety provisions according to VDE 0411, part 1: probe voltage and maximum discharge rate stay below the limit values as specified by the safety standard.
  • Low-battery indicator

Complete Kit

The PoroTest 7 will be delivered as a kit, including:

  • Control unit with integrated storage battery
  • Connecting cable probe-control unit
  • Metal brush
  • Grounding cable, 5 m (16 ft) length
  • Power cable
  • Shoulder belt
  • Plastic carrying case
  • Manual


DisplayLC-Display, 3-digit
Accuracy of voltage setting± (0.1 kV + 3% of reading)
Dimensions of high voltage probe274 mm x 63 mm
Dimension of control unit225 mm x 150 mm x 85 mm
Weight high voltage probe550 g
Weight control unit1400 g
Alarm signal90 dB, 0.1 s/Pore, continuous tone in case of short-circuit
Signal outputpotential free, Umax.: 100 V, Imax.: 0.4 A
Storage battery4 C-cells, IEC LR 14, 3.5 Ah, NiMH, replaceable
Storage battery life at maximum voltagePoroTest 7-P7: 20 hours continious operation PoroTest 7-P30 & P35: 10 hours continious operation
Storage battery charging time4 hrs quick charge
Mains voltage110 to 230 V, 50/60 Hz, automatic switch
Operating temperature0°...+50°C/ 32°...122°F
Humidityavoid dew on the surface (refer to DIN 55 670)
StandardsDIN 55 670, ASTM D 5162-01, AS 3894.1-2002


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Item Description Price
PoroTest 7 Porosity Holiday Detector Kit (without Electrode)
PoroTest P7 High tension electrodes - 0.5-7 kV - 0.03-1.7 mm
PoroTest P30 High tension electrodes - 3-30 kV - 0.5-9 mm
PoroTest P35 High tension electrodes - 5-35 kV - 1.4-11.3 mm
PoroTest Silicon Electrode 200 mm
Spring electrode 100mm/4" diameter for use with PoroTest - requires holder
Spring electrode 150mm/6" diameter for use with PoroTest - requires holder
Spring electrode 200mm/8" diameter for use with PoroTest - requires holder
Spring electrode 500mm/20" diameter for PoroTest 7, requires holder
Holder for spring electrode, 17.5 mm (PoroTest 7)
Holder for spring electrode, 27.5 mm (PoroTest 7)
In stock
1 Week Lead Time (Estimated)
2-3 Week Lead Time (Estimated)
Lead Time Varies, Please contact us for availability.