Airspeed Meter Gauge with Differential Pitot Tube Kit, Durable Metal Air Speedometer for Flight Control, Includes Soft Silicone Tube, Precision Aviation Instrument

The end of this pitot tube is the total pressure point and should be pointed toward the air flow. I had to add an elbow to the end of this tube to make it work correctly. Also it is rather short, so not usable for large ducts. I guess one could use it outside of a duct in a very windy environment or on a vehicle of some sort to measure air speed. I should have bought the 'L' style instead. I am using this in 4 -5 inch ducts for dust collection system analysis so with the elbow it is acceptable.I wouldn't recommend it for HVAC use; get the 'L' style instead.

Do not fly this if you fly ultralight aircrafts