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How do you zero it?
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Like UNV said, it has adjustments to align the range finder with your scope.
It has a visible red laser you turn on. You measure the distance (X and Y) from the centerline of your optic to the placement of your radius red laser. Then mark the spot(usually with a reflective dot to make it easier) on your target that far from your aim point. You adjust the laser so when your cross hairs align with the aiming point your laser lands on the reflective dot. This lets you put the cross hairs on anything you want to range and get the distance. Of course the range finder will be offset slightly from your scope. In my case it's 2.843 inches directly above the scope. I like it directly above the scope so I don't have any horizontal offset to account for.
I need to take it out at night and see what my IR laser spread looks like and compare it to the red laser position. I'm not sure which side is the emitter, but I expect at close range the IR laser starts ~1" left or right.
I know the beam spreads, I guess I should look it up, I think it's in the manual.