Mil-Dot Range Finder for iPhone
From their website ...
Mil-Dot Rangefinder for the iPhone takes the math out of ranging targets using a mil-dot scope. Real-time calculations provide instant range measurements in both yards and meters. The simple interface allows for one handed operation and eliminates any need to manually type any measurements to range a target.
It costs $1.99 for the standard version and $9.99 for the pro.
