The invention relates to a device (14) for detecting an inertial size (16), comprising– a triaxial inertial sensor (26) for detecting a first measured value (42, 44, 46) for the inertial size (16),– a two-axis inertial sensor (28) for detecting a to the first measured value (42, 44, 46) redundant second measured value (48, 50) for the inertial size (16), and– a device (52, 58, 64) for plausibility checking of the first measured value (42, 44, 46) on the basis of the second measured value (48, 50).
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