Many golf rangefinders use GPS technology to calculate distance. But Bushnell Pinseeker 1600 Tournament Edition is a state-of-the-art product uses a laser to calculate distance. It has an advanced digital technology to measure the yardage in the most sophisticated manner. The distance is calculated in seconds after the device is switched on. This device has a 7 x magnified monocular which allows a clearer view of the target even in bad weather condition. Its diopter can also be adjusted to +/- 4 points so even those with poor vision can view the target very clearly. The most amazing feature of this rangefinder is the slope mode which measures the elevated slope to +/- one degree. The device is also 100% waterproof and has a RainGuard coat so it can survive any weather condition.