BMW offers a magnetic test card for wheel speed sensor incremental rings. 

The test card is designed to check the integrity of magnetic rings for wheel speed sensors that are embedded inside the wheel bearing.

The test cards are made by the Brinson Co. and are available as BMW  P/N 83 30 2 296 188.

BMW magnetic test cards for checking wheel speed sensor rings.

BMW magnetic test cards for checking wheel speed sensor rings.

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