Useless. I wish I could return this one. I put it in the position according to the manual and also tried other positions. Rate of turn readings range from 80 to 94 mph. I know the true rate of turn is about the same, max +/- 2 mph. Exactly the same swing, one reading was 80mph and the next 94mph, I didn't change the position of the device, the ball was placed in the same position on the mat. October 31, 2018, a few months later. after I bought this radar. I finally got a tracker a few days ago. After 10 shots, this radar reading is 10 mph off the trackman at worst, and several readings were within 2 mph of the trackman. This radar is very unstable. Now I'm sure it's complete nonsense. Don't waste your money on it.
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