Not worth it, trial would have been nice

Distance Calibration is manual and full field evaluation is required. Helpful if environment is always the same, however, the app could have been better written to include gps positioning or even pacing to gauge distance.

Mathematically it appears to be a sound and functional app after the appropriate precise and accurate calculations are entered. only giving two stars for the lack of usability and amount of manual work necessary to make it work.

Digital.syncope about SpeedClock - Video Radar