Mevo+ is a low power Doppler radar using phased antenna array technology to detect and track golf ball launch and flight. It measures the speed of the ball, as well as the position of the ball as it progresses along its flight path. Sophisticated mathematical estimators are used to track the ball even under adverse conditions, using the physics of ball flight to overcome random noise and fading conditions experienced in the real world. The phased array technology also picks up tiny variations in the Doppler signals caused by the spinning motion of the ball, enabling direct measurement of the ball spin rate.
Long answer short, yes the FlightScope Mevo+ is accurate!