“PosiTest HHD Pulsed High voltage Holiday Detector.
Detects holidays, porosity, pinholes, leaks, and other discontinuities in coatings, linings, and membranes using pulse or continuous DC.
The PosiTest HHD High voltage Holiday Detector uses pulse DC technology to detect holidays, pinholes, and other discontinuities on metal and concrete substrates. User adjustable voltage range from 0.5 to 35 kV.”