How does a rangefinder work? Simple and quick, ATN's Auxiliary Ballistic Laser (ABL) attaches to your ATN Smart-HD scope as the strongest supplement that you can find on the market today. As the best rangefinders for ATN Scopes, the ABL Range finder utilizes smart controls which will relay the corrections you need to make to your shot quickly to your ATN scopes. Its powerful capabilities allow you to do what you love without all that complicated math you are used to. This series of rangefinders will make your next hunting trip as enjoyable as possible, so you can relax and know that this digital rangefinder will show the Distance to Object on Video.