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An airsoft chronograph is a divice to test the velocity of the BB as it leaves the end of the barrel. They usually work with a radar or light beam. As the bb passes through or over the chronograph, the velocity is recorded on the screen. Some more advance models will also measure the number of shots per second as well.
It is essential that you regularly chronograph your airsoft rifle or pistol to make sure it's within legal and site limits.
Remember that airsoft legal limits are set by Jouls of energy, so the heavier the bb you are using, the lower the velocity you are allowed to have.