product - Quantity: 100 Color: yellow Specifications: 20x20mm/30x30mm/40x40mm/50x50mm/60x60mm Material: acrylic Quick positioning with a speedometer and all common measuring instruments Long-term monitoring of bridges and buildings Measure and monitor facades, even around corners Height and axis transfer around corners and from inside to outside Can even be installed on difficult surfaces Crosshairs are printed on the backplate below the precise center of the reflective target to ensure permanent marking of the measurement point. If the reflective target is damaged at any point, it can be easily replaced and the original measurement point can be restored quickly, easily and inexpensively. Application: tunnel engineering, subway engineering, bridge engineering, building construction, slope monitoring, ship inspection, etc. Package includes: 100* Reflector