The MadBull Version 2 Airsoft Chronograph is a multi-purpose chrono for airsoft replicas. This will measure a variety of settings, and includes a USB port to charge rechargeable AAA batteries (not included).
MadBull V2 Airsoft Chronograph Features:
-Feet Per Second
-Meters Per Second
-Bullets Per Second
-Bullets Per Minute
-Measures Joules with BB from .20 up to .33, .43, and .89