Introducing the Stalker Pro IIs! Capture Ball Spin Rate with a hand-held radar gun. It's a whole new ballgame! Stalker engineers have delivered what the other sport radars can’t - Spin Rate from a hand-held sport radar gun. One of the most important pitch analytics, Spin Rate is now provided along with Peak and Across-the-Plate velocity, all in a single window. No delay, no estimations, simple measurements. Another game changer from Stalker.