It should be accurate if the distance has been entered correctly. It detects the sounds of tip hit on CB and CB hitting the OB, then uses speed of sound (approx 330 m/s) and distance to give break speed.Is the break speed app very accurate? I have it but don't have a chance to test it with any other device so I'm not sure if my results are true.
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Not sure how accurate radar guns are.
FWIW: Using the app I found anomalous readings were very rare. After a few hits, I could predict the speed within 1mph based on how it felt and sounded and the app would concur.