The PosiTest HHD is a high voltage holiday detector that detects holidays, porosity, pinholes, leaks, and other discontinuities in coatings, linings, and membranes using pulse DC. Its lightweight, ergonomic design provides comfortable all-day use, reducing operator fatigue. Regulated pulse DC voltage output that won't change under load with ±5% voltage accuracy. Features a voltage calculator: just choose one of 11 international standards, and input the coating thickness to automatically calculate the required test voltage. Choose from a wide range of rolling spring and flat wire brush electrodes or use electrodes from other manufacturers with optional adaptors. Custom sizes are also available upon request. Long Form Certificate of Calibration included with each instrument.