Features 500m Measurable: Measure distances from 5 to 500m with high accuracy of 0.5 yards, perfect for various golf courses. Slope Function: Get accurate yardage with slope calculation, helping you select the right club for your game. Ideal Golf Tool: Quickly lock onto targets and get precise yardage for confident shots. Diopter Adjustment: Customize the view with a diopter adjustment function around 5D for enhanced vision. 6X Optical Magnification: Enjoy clear visuals with 6X optical magnification for improved shot clarity. Item Type: 360° Prism Material: K9 Glass, ABS Constant: Approx.+23.1mm / 0.91in Effective Diameter: Approx. 25.4mm / 1in Scope of Application: Tunnel, subway, mine, highway detection, applicable to other measuring instruments Uses: Widely used in subway, railway, tunnel, dam, steep slope and other industries 1 x 360° Prism 1 x Storage Bag Package List 1 x 360° Prism 1 x Storage Bag