T.O. 33B-1-2 is a U.S. Military Technical Order, specifically a manual titled “Nondestructive Inspection General Procedures and Process Controls”. It provides standardised, step-by-step procedures, safety guidance, and process controls for NDI technicians to perform inspections—such as magnetic particle and liquid penetrant testing. To learn the foundational theory, principles, and techniques check the T.O. 33B-1-1.