If you're looking to measure the speed of projectiles firing out of your airgun, you'll need a chronograph. Should you measure the speed of every single shot you fire? No, but you should know what speed a particular pellet comes flying out of your airgun, so you can monitor your gun's performance at different intervals. This will help determine if your gun is not performing correctly.
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Competition Electronics
Competition Electronics Replacement Diffuser Pack, Fits ProChrono Chronographs
MSRP: $21.99$16.49 -