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Survey 25mm L-Bar Double Mini Prisms/ Dual Sided L-Bar Monitoring Prism Bar. High Accuracy Prism: Each prism inspected by Zygo interferometer to guarantee beam deviation and positional accuracy. Dual-Sided Design: 25.4mm BK7 glass corner cube prism with dual-sided L-bar for versatile surveying applications. Customizable Options: Custom coating (Silver), constant (+6mm), and frame material (Aluminum Alloy) available. Long Range Measurement: Effective distance range up to 2,000m for precise electronic distance measurements. Durable Construction: Metal outer housing with aluminum alloy frame, designed for deformation and mining surveys. 1 Year Warranty: Comprehensive 1-year warranty coverage for the prism and L-bar monitoring system.