MEASURING DEVICE=MANOMETER.. procure a sophisticated or fabricate a simple one [ u-tube]see below.. diy u-tube measuring in inches of water. put red dye in the water .
clear plastic tube of small dia. should suffice[ find in the aquarium supplies at the local pet store]
one end of the u tube is open to cockpit air .. the other end extends to the test site. end of tube *should not* be exposed to ram air effect like a pitot tube [that device measures air speed by ram ait effect] i presume you wish to measure over pressures [compression] or under-pressures [ lift?]
in other words the opening of the tube at test site should face away from the expected air flow or be perpendicular to it ..
at rest with equal pressures on both ends the level on both sides is the same .
at measurement speed .. assuming overpressure measured the upstream side is lower and the down stream side is higher .. the *inches of water * pressure measured is the difference in the height
Pressure measurement - Wikipedia, the free encyclopedia
U-Tube Manometer
and if that config is not sensitive enough use this
Inclining the tube manometer will increase the accuracy of the measurement.