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# pitot tubes

## Appears In

                        - Big Improvements in New Probe Design for Smokestack Emission Monitoring

The NIST pitot tube (top) has a hemispherical face with five ports used to measure gas flows in three dimensions, which gives it a better ability to measure complex flows in smokestacks. In contrast, the current favorite model of pitot tube, called an S-probe (bottom), only has two ports and can only measure flow in one or two dimensions. Unlike previous models of 3D probe, the NIST probe, when calibrated, does not take longer to use in a measurement than S-probes.

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