Features 500m Measurable: Measure distances from 5 to 500m with high accuracy of 0.5 yards, suitable for various golf courses, providing precise yardage for your shots. Slope Function: The slope function calculates accurate yardage, aiding in club selection for improved shot accuracy on uneven terrains. Ideal Golf Tool: Quickly lock onto targets, compact and user-friendly, enhancing your golfing experience. Diopter Adjustment: Customize the diopter around 5D for clear vision, ensuring a comfortable viewing experience. 6X Optical Magnification: Enjoy clear and magnified shots, providing a detailed view of your target for improved precision. Item Type: Prism Lens Material: k9 Glass, ABS Effective Diameter: Approx. 64mm / 2.5in Constant: 0mm, -30mm Application: Widely used for testing tunnels, subways, mines, highways, dams, steep slopes, etc., suitable for measuring instruments. 1 x Prism Lens 1 x Cover 1 x Storage Bag Package List 1 x Prism Lens 1 x Cover 1 x Storage Bag