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17.8mm Square Monitoring Mini Prism Reflector for Road Construction and Subsidence Survey. Customized Design: Product is fully customizable to meet specific surveying requirements. 1-Year Warranty: Comprehensive 1-year warranty coverage for mechanical defects. High Accuracy: Delivers 5'' accuracy for precise road construction and subsidence surveying. Durable Aluminum Housing: Constructed with robust aluminum housing and BK7 glass prism for longevity. Versatile Installation: Supports both screw fixing and adhesive mounting for flexible application. Long Measuring Range: Effective measuring range up to 1000m for extensive surveying tasks. ISO 9001 Certified: Manufactured under strict ISO 9001 quality management system standards.