Overview for the Leica GPH1P Single-Prism Precision Reflector    The Leica GPH1P Single-Prism Precision Reflector is a high-accuracy and high-performance reflector that enhances the measuring range of the laser. It is a 62-millimeter in diameter circular prism with a range of 11,500 feet (3500 meters) and a centering accuracy of 0.3 millimeters.   The GPH1P reflector has a prism that is copper coated and precisely machined for high accuracy requirements. Its prism diopter or holder is slightly tilted to prevent any EDM reflection from the front surface thereby increasing measurement accuracy.