True Ballistics Chronograph Users

Looking for some information on this chronograph. Does anyone have any experience with it at shorter indoor ranges? Looking through the user manual I see 25,50,75 and 100yd ranges that it is calculating from. Could this be used at shorter ranges such as 10-15 or will it not even pick up a reading at that short of distance? It's winter here so I'm limited to 15 yards indoor, and I currently don't own a chronograph but was hoping it would work for both when I'm shooting 100yd BR in the nicer months. Thanks