Short battery life - Sighting System Instruments Sight Right Bullet Laser Bore Sighter 9mm

I received the bore sight in a timely manner. It fits the 9mm perfectly and has a precise fit to the chamber. It showed that my internal laser was off by a quarter of an inch. I felt that this was accurate. The only downside is that it is hard on batteries. I had to replace them after sighting only two weapons.