Welcome to our store! Specifications: Double-sided right-angle optical prism; prism constant is -25mm, effective diameter is 25.4mm, accurate and stable. Optical Glass: This double-sided prism uses excellent optical glass, with fine cutting and polishing to ensure accurate measurement. Excellent Reflection: Superior coating enhances the prism's reflectivity, making it clear and bright, improving measurement accuracy. Plastic Housing: Oxidized plastic-coated lens ensures good wear resistance and impact resistance, significantly extending the prism lens's lifespan. L-Shape Stand: The right-angle prism features an L-shaped stand for stable operation, widely used for railway, tunnel, and highway detection. Item Type: Right Angle Prism Material: Optical Glass, ABS Color: Black Constant: -25mm Effective Diameter: Approx. 25.4mm / 1 inch Application: For the detection of tunnels, railways, mines, highways, dams, steep slopes, etc. 1 x Right Angle Prism Customer satisfaction is our top priority. If you encounter any issues with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best after-sales service.