stalker pro iis sports radar - the only hand-held baseball radar gun that captures ball spin rate in real time - no delay and no estimations. stalker 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.