Magnaflux and ultrasonic examination are both non-destructive testing (NDT) methods used to detect surface and subsurface defects in materials, but they operate on different principles and are suited for different applications.
### Magnaflux (Magnetic Particle Testing)
**Principle:**
- Magnaflux, or Magnetic Particle Testing (MPT), uses the principle of magnetism to detect surface and near-surface discontinuities in ferromagnetic materials.
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