Measured spin is read from the ball. Calculated spin is estimated from club and launch data. Some radar units measure spin indoors only with marked balls or metallic stickers. For wedge play, curve and fitting, measured spin is the safer choice.
Three ways launch monitors get spin
| Method | How | Where you'll see it |
|---|---|---|
| Measured | Cameras photograph the ball's rotation, or radar reads it over enough flight | Most camera and overhead units; tour radars outdoors |
| Measured with marked balls | Stickers or printed patterns give the sensor something to track in a short indoor flight | Several portable radar units indoors |
| Calculated | Spin inferred from club speed, loft and launch | Some entry radar units |
Our measured-spin list ranks every model whose listing says spin is measured directly.
Why it changes the shot
Back spin keeps the ball in the air; side spin (or spin-axis tilt) curves it. If spin is estimated from averages, a thin wedge or a toe-struck driver can fly in the simulator like a good shot. That matters less for casual course play and more for practice and fitting.
Marked balls and stickers
See marked balls and club stickers for which models need them and for what.
Products mentioned
Garmin Approach R10
Radar · Behind the ball · 17–19 ft deep
Rapsodo MLM2PRO
Radar + camera · Behind the ball · 16.5–18.5 ft deep
Square Golf Omni
Camera · Beside the ball · 13.5–15.5 ft deep
Figures marked as FOREference calculations show their working; product figures come from the sources on each product page. How we work