The Yellow Button version of the X-Radar handheld chronograph velocity tests Byrna / / Valken / Umarex projectiles, Airsoft (0.2g and heavier), and Paintballs up to 698 fps.  Works indoors and outdoors using advanced 24 GHz doppler radar technology.  Measures both Velocity (150 - 698 fps) and Rate of Fire (4 - 30 bps).  
     Accurate.  Reliable.  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 velocity testing Paintballs exclusively up to 399 fps, the Red Button X-Radar has been optimized for this purpose and is the best choice.   Byrna / Valken / Umarex projectiles and Airsoft BBs often exceed 399 fps.  So for velocity testing these various faster projectiles up to 698 fps, as well as Paintballs, the Yellow Button X-Radar is the best choice.  Both are available on Ebay.
     ONE PER CUSTOMER PLEASE - limited production.