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It's gathering the measurements right now.This is what's known as a plethysmograph.And it's actually a chart of the heartbeat.
Listen to native speakers pronounce “plethysmograph” in real conversational contexts with synchronized timestamps and subtitles.
An instrument for determining and registering the variations in the size or volume of a limb, as the arm or leg, and hence the variations in the amount of blood in the limb. -- Pleth`ys*mo*graph"ic, a.
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