一般来说，用于测量这些参数的感测器分别为加速规、位移计(proximity probe)，以及麦克风。很显然地，感测器类型决定了您所选择的硬体，并导致以下关于硬体的问题：
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Reading out the advice provided on the matter at the time, he said one of the reasons he was given for not beginning a probe was the proximity of a general election and the feeling that such a move could be seen to be "politically motivated".
BBC: Brown in ferocious Commons attack on News International
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