FX Pocket Wireless Chronograph V2 / MK3 BluetoothAirgunners Rimfire paintball shooters want to know the velocity and power coming out of their rifle. This is especially important with FX Airguns that allow the ability to tune, change calibres, and change barrel liners. A chronograph is a key tool needed to maximize the accuracy of your rifle. In the chronograph world, you really only have two options: The expensive complicated units that give you most of what you need, but cost far too much, or the