Paintball chronographs, or chrono's for short are devices for testing the velocity of your paintball as it leaves the end of the barrel. Most paintball sites have a limit of 280 to 300 feet per second.
A paintball gun firing "Hot" can be dangerous and may well get you a site ban.
Paintball Chronographs
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Paintball Radar Chronograph X£112.95
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Paintball Radar Chronograph Red£294.95