Redfield Accutrac Question

I just picked up a Redfield Wideview 3 x 9 Accutrac scope for one of my bolt guns and this is the scope that has a built in range finder. The company is out of business and I'm trying to find out how the range finder works. It has two verticle lines above the crosshairs and yardage numbers from 200 to 600 yards. The optics on this scope are very good clear and bright. Any help would be appreciated.
Thanks

http://www.abousainc.com/ATsystem.htm

Redfield in Denver went out of business but a company in Florida bought the assets and name and I believe is producing Redfield line scopes again. From what I have read, they will still honor the original Redfield company lifetime warrenties.

SS

A large optics company bought Redfield and a few other optics companies. The company is called Meade and is a large telescope company. They do not support the old Redfields. Only the ones made after they bought Redfield.