“PosiTest HHDC Continuous 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 C High voltage Holiday Detector uses continuous DC technology to detect holidays, pinholes, and other discontinuities on metal and concrete substrates. User adjustable voltage range from 0.5 to 30 kV.”