C) - 67.5 volts Holiday Detector

The M-1 is known Worldwide as the best choice for the inspection of thin film coatings (0 to 20 mils). The totally redesigned M-1 now uses six "AA" batteries and advance circuitry to produce 67.5 volts. With on-board calibration verification, the M-1 can be checked in the field with no other test apparatus needed.