PowerHobby GNSS Performance Analyzer 

GNSS Performance Analyzer（GSM020) allows you to measure and analyze many aspects of your RC car & airplane’s performance using the latest GNSS engine (GPS, GLONASS) which gives you Acceleration, G-force, Speed, Distance, and Time. This device uses a barometric pressure sensor to detect the height above the ground level. it can measure peak altitude up to 29,500 feet (9000)m).