Opti-Logic InSight GT Golf Laser Rangefinder (Yellow, 1.7 x 4 x 5.1-Inch) Modes include: Line-of-Sight, PinPoint, and Slope-Compensated Horizontal Distance Setting options include: standard and reflective readings; standard and reflective readings with audible signal Accurate reading within one yard USGA/R&A compliant in modes 1 and 2; mode 3 is not compliant