JonnieZG gives us an overview of the Custom Chronograph CMEE BCX100 which he built himself... "One of my first airsoft projects that turned out to be my most valuable tool in servicing my airsoft replicas. It works great even with pellet guns and other cold-launched projectiles.

Beside being very accurate it provides useful statistical analysis such as standard deviation. You can also contact to it wirelessly by a smartphone or a PC to get a detailed report.