In stock right now at WGC Shop is the ACETech AC6000 Chronograph for use in airsoft which they sau is of high quality and accuracy. It can measure muzzle velocut from 90 feet per second to 1,200 feet per second and ROF range of 100-6000 RPM. The are ammo parameter settings with 5 memory slates and an IR sensor that has calculation functions. It can be powered via Micro-USB or use 4 AAA batteries.