I've just updated a little set of Android Apps that are useful in many telemetry related issues. The main reference page is http://www.basicairdata.eu/mobile.html .
The apps are free and open source, part of BasicAirData Project. Calculations algorithms documented.
GPSLogger; It is a straight forward GPS Logger; It corrects the altitude measurements with NASA EGM model.
http://www.basicairdata.eu/android-gps-logger.html
Air Properties; calculates air density, viscosity, compressibility factor, vapor pressure, speed of sound for moist air.
http://www.basicairdata.eu/android-air-properties.html
Android RTD ; Converts resistance reading into temperature value for RTD temperature sensors. Uses Callendar-Van Dusen equation.
http://www.basicairdata.eu/android-rtd.html
At your disposal for any issue
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