Extech-HD350-Pitot-Tube-Anemometer-&-Differential-Manometer-EXTECH-HD350-P-This-handheld-Extech-HD350-Pitot-Tube-Anemometer-&-Differential-Manometer-measures-&-displays-air-velocity-speed-air-flow-volume-ambient-air-temperature-&-gauge-differential-pressure-By-means-of-the-very-small-pilot-tube-the-Extech-HD350-enables-the-measurement-of-air-current-in-cramped-places-small-openings-or-thin-pipe-systems-The-speed-measurement-is-done-by-means-of-the-differential-pressure-meth