Magnaflux Pie Field Indicator

The Magnaflux Magnetic Pie Field Indicator, also known as a pie gauge, is a device used as an aid in determining the direction of magnetic field for detection of discontinuities in ferrous materials. It is an octagon-shaped piece made with a low retentive steel surface having eight bonded slices, similar to pieces of pie. The octagon-shaped piece is mounted on a handle so the inspector can place it on the part in the area being magnetized. With an adequate amount of magnetizing current and proper particle application, the pie gauge will show indications in the same direction natural indications would appear.