Great product with good instructions, the bluetooth feature is very convenient - Competition Electronics ProChrono DLX with Bluetooth

Been handloading pistol ammo for years without a chrono, should have got this years ago. Sets up easily and the instruct manual is well written, especially regarding fluctuating light conditions. Used it to clock my supply of half dozen brands of 22 ammo as am looking at rimfire suppressor cans. Tested in 2 different Ruger 22 rifles, short and std rifle barrels. Turned out all were pretty close to stated speeds by the mfg but didn't find any to be subsonic. Must have device for handloaders and competitive pistol shooters to verify power factor. The bluetooth feature and the free SW download are great. You can even send your data to other devices.