Initial Velocity Measure Range:30.00 ~ 400.0 (m/s)
ROF Measure Range:100 ~ 5000 (RPM)
Tube Diameter:24 mm
Battery:2 x AA batteries
Remark:If use a gas or CO2 gun to measure speed, smoke will be generated. It is recommended that the distance between the muzzle and the chronograph is more than 10 cm to avoid smoke interference.