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The EC6 is two plethysmographs in one. A mercury strain gauge plethysmograph accurately measures volume changes in limbs or digits. It is used, in conjunction with blood pressure cuffs, to measure blood pressure, pulse volume waveforms and amplitudes, and blood flow into or out of limbs and digits. The instrument also contains an infrared photo plethysmograph which, although not calibrated, is a sensitive pulse detector which is used to evaluate pulse wave shapes and measure blood pressure in the extremities in conjunction with blood pressure cuffs.

The EC6 is two plethysmographs in one. A mercury strain gauge plethysmograph accurately measures volume changes in limbs or digits. It is used, in conjunction with blood pressure cuffs, to measure blood pressure, pulse volume waveforms and amplitudes, and blood flow into or out of limbs and digits. The instrument also contains an infrared photo plethysmograph which, although not calibrated, is a sensitive pulse detector which is used to evaluate pulse wave shapes and measure blood pressure in the extremities in conjunction with blood pressure cuffs.

I am sorry, but based on the provided text, there is no information about the acceptance criteria and the study that proves the device meets the acceptance criteria. The text is a letter from the FDA regarding the substantial equivalence of the "EC6 Plethysmograph" to legally marketed predicate devices, and an "Indications for Use" statement. It does not contain details about performance studies, sample sizes, ground truth establishment, or expert qualifications.

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