The percent slope measurements mean for a given distance, your elevation will increase or decrease that percent of the distance. I.e. 7% downgrade means if you travel 100 ft, you'll drop 7.
Also torque can read and clear trouble codes, and it's only free, well the free version is, but it's not quite as nice as the paid version, which is $5. Both will need a OBD2/Bluetooth adapter, which is $15-20.
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