The most powerful Laser Rangefinder in the world. The Pro X7 features incredible ranging capability (550+ yards to a flag). The Pro X7 is accurate to 1/2 yard. Features 7x magnification with HD optics. The Pro X7 is waterproof and tour certified. Slope Technology measures slope, +/- one degree of angle, and compensated range, based upon ball trajectory and type of club used. All shown on an LCD display. A 150-yard uphill shot of 6 degrees really plays at 166 yards. Without slope compensation you would come up 16 yards short.