Well for starters like the quality ,pros & cons, type of batteries thay use (life),sighting one in ,beam quality in daylight ,beam size and brightness ECT.
crimson makes one of best laser on the civilian market,thCrimson Trace has the most powerful beam allowed by law, a Class IIIa visible light diode. At night, in reduced light and indoors the laser is highly visible up to several hundred yards. Under bright sunlight, the dot can be seen up to 15 yards away.They use#2032 batteries
Lasergrips are factory-sighted to approximate point-of-impact at 50-feet. you can adjust them if needed by turning the tiny windage (side) and elevation (top) screws with the small hex wrenches provided with your Lasergrips