You think that a pitot-static tube is not correctly working. To test the Pitot static tube you place it in a wind tunnel with a velocity of 34 m/s The pitot-static tube is connected to a manometer. The liquid in the manometer has a specific gravity of 1.7. In order to determine if the manometer is working correctly, calculate what height difference you are expecting in the manometer.. Take the density of air at sea level using the International Standard Atmosphere.