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Figure 1: Fleisch Pneumotach (left) and for comparison, the Feather Sensor probe (right) containing a strain gauge.
P1 and P2 refer to pressure, and at the bottom of the pneumotach is a
differential pressure transducer.
The Feather Sensor probe (right) has no air tubes and only two wires embedded in the base connected to an audio jack. The sensor (orange) is mounted perpendicular to the airflow.
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