Most chronographs consist of two sensors a short distance apart that you shoot a projectile through while the unit is activated. The device measures the time it takes the bullet or other projectile to pass between the two sensors, then calculates the projectile's velocity, generally in feet per second.

How does a MagnetoSpeed work?

MagnetoSpeed's barrel-mounted ballistic chronographs use patented electromagnetic sensors that are designed to operate in the harsh environment at the muzzle of firearms. ... Using the provided spacers, the shooter adjusts the bayonet so that the bullet will travel just above unit's sensors.

What is a chronograph for use with ammunition?

In a nutshell, a chronograph lets you measure the speed that the bullet leaves the barrel. ... The speed the bullet leaves the barrel, often expressed in FPS (feet per second) or MPS (meters per second) is known as it's velocity. This is often given to you on the outside of factory bought ammunition.