laminated strips and notched shims in Magnetic Particle Inspection

Hi

Can someone please explain this?

ASTM E1444 states that "Magnetic Field Strength may be determined by using notched shims (ASTM E1444, 6.3.1.1.).

ASTM E1444 states that "Magnetic Field Directions may be determined by using flexible laminated strips (ASTM E1444, 6.2.5)

What is the difference between laminated strips and notched shims. Why laminated strips cannot be used for both checks or vise-versa?

Regards

Niranjan.

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