An airsoft chronograph is a small yet useful piece of kit that will measure different aspects of your Airsoft Guns output. All chronographs will measure basic muzzle velocity and can give your FPS (feet per second) readout which is especially helpful if you are playing at a site with a restriction on total airsoft gun speed or where on the site certain types of airsoft gun are allowed to be used. Different makes and models will offer different features such as rechargeable batteries, Bluetooth, multi-function measurements, mobile apps and some chronographs can be used with differing sizes and weights of ammo for BB Guns. Some of the larger pieces of kit can even take readings of larger projectiles such as paintballs. As a result of the different specifications available, it is important to look into the different chronograph models available online at Just BB Guns to find the one that meets your requirements.