FACTORY DIRECT X-RADARS.  The Paintball industry standard X-Radar (Red Button version) handheld radar chronograph clocks Paintballs and Pepballs up to 399 fps.  Works indoors and outdoors using advanced 24 GHz doppler radar technology.  Measures Velocity (150 to 399 fps) and Rate of Fire (4 - 30 bps).      Easy to use (see photo #2).  Standard 9 volt battery power (not included).        MOST ASKED QUESTION:  RED BUTTON OR YELLOW BUTTON X-RADAR???????????????            ANSWER:  For paintball players velocity testing Paintballs and Pepballs exclusively up to 399 fps, the Red Button X-Radar has been optimized for this purpose and is the best choice.  Byrna / Umarex / Salt LL projectiles and BBs can exceed 399 fps.  So for velocity testing these various faster projectiles up to 698 fps, as well as Paintballs and Pepballs, the Yellow Button X-Radar is the best choice.  Both are available on Ebay.