Description: 【Optical Glass Lens Precision】: This accurate reflective prism features precision cut optical glass that delivers exceptional clarity and visual effects for measurements within 800 meters. The meticulously polished surface ensures minimal light distortion and maximum reflectivity. Ideal for professional land surveyors and engineering projects 【Enhanced Reflectivity Performance】: The quality optical glass significantly improves reflection capability, providing bright, clear signals that ensure precise measurements and reliable data collection. The enhanced reflectivity maintains accuracy even in challenging lighting conditions. Great for long range surveying applications 【0mm Prism Constant】: Specifically calibrated with 0mm prism constant for seamless compatibility for total stations and GPR1 GPH1 systems. The precise calibration eliminates calculation errors and simplifies data processing 【Sturdy Construction Design】: Built with sturdy materials that withstand harsh field conditions while maintaining structural integrity and optical alignment. The robust housing protects the precision components from impacts and environmental damage. Great for demanding construction sites and topographic surveys 【Professional Surveying Accuracy】: Delivers exceptional measurement precision through fine craftsmanship and exacting manufacturing standards. The round prism design provides consistent performance from all angles. Ideal for cadastral mapping and engineering layout applications Specification: Material: Glass, Plastic Size Chart: 9.5cmx13cm/3.74inchx5.12inch Package Includes: 1 Reflective Prism Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.