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Maybe you mean a chronograph?

1. A chronograph is a must have for ME. I test pistol ammunition for power factor, rifle ammunition to get into ballistic charts for Long Range sight settings, and black powder ammunition for consistency which translates to better accuracy for those low velocity rifles.

2. The Shooting Chrony is about a hundred bucks and will give velocity about as well as the more expensive units, just without the bells and whistles.

3. The usual recommendation is for the start screen to be ten feet from the muzzle so as to avoid confusing the sensors with muzzle blast. You can sneak up on it with a pistol but I don't know if one would work inside the usual stall of an indoor range. Fluorescent lighting as is common indoors will confuse one, too.
 
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