Most chronographs perform best when the bullet passes over the sensors at a specific height range. Read the directions that came with the chronograph to find out how many inches you can shoot above the sensors and then mark the uprights with tape or something similiar at the bottom and top of the range so that when you set the unit up it's the correct height between you and the target. I use black electrical tape since I shoot outside but a brighter color might be better.
Last edited by UtopiaTexasG19; November 6, 2011 at 01:31 PM.
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