PCN Certification is awarded once the student has demonstrated the required experience and training hours and has successfully completed the PCN examination: Ultrasonic Time of Flight Diffraction (TOFD) Level 2: Training Hours: 40 hours Experience: 9 months Direct Access to PCN Level 2: Direct access to PCN Level 2 can be achieved by combining the experience and training hours of both Level 1 and Level 2: Training Hours: 80 hours Experience: 12 months