Lock in your yardage and take dead aim with the Callaway 300 Laser Rangefinder. Pin Acquisition Technology (P.A.T.) helps quickly and accurately find the pin from up to 300 yards away and uses the scan mode to acquire multiple distances at once to hazards and other objects down the fairway. The 300 pro model features BIRDIE technology using an audible chirp to confirm you've locked onto the target and a slope function that measures the angle of incline/decline to give a more accurate reading.