The ptFlex and ArduinoTrack are the all-in-one APRS tracker, specifically designed for high altitude ballooning. With built-in temperature, barometric pressure, and battery voltage monitoring capabilities, it can be ready for flight within minutes.
ptFlex assembled with DRA818V transmitter.
Bare ArduinoTrack PCB for assembling your own tracker.
ArduinoTrack assembled with the on-board HX1 transmitter.