Wiktionary
statoscope
n. An instrument used for indicating or recording small changes in barometric pressure or in the altitude of an aircraft.
Usage examples of "statoscope".
The verimeter, or statoscope, indicated that the rate of ascent was increasing as the sun warmed the gas in the bag.
Before him were compass, aneroids, bubble statoscope, air speed indicator, inclinometers, rise and fall indicator, bearing plate, clock and thermometers.