Alternatively, calibration may be checked using a Polarization Reference Standard, which consists of a plate of quartz mounted in a holder perpendicular to the light path.
或者，校准可以通过使用一个偏振标准品来进行，该标准品由一片装在垂直于右侧通道的架子上的石英构成。
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This exclusive key holder offers a mirror and a small photo frame in bronze snakeskin and Smoky Quartz Crystal Mesh.