Features: Quick positioning with tachometers and all common measuring instruments Long-term monitoring of bridges and buildings Measurement and monitoring of facades, even corners Height and transfer in corners and from inside to outside Can be installed even in difficult places Crosshair is printed on the back plate just below the center of the reflective target, permanent marking of the measuring point. If the reflective target is damaged at any point, it can be easily replaced and the measuring point can be restored quickly, easily and cheaply. Application: Tunnel engineering, subway engineering, bridge engineering, building construction, slope monitoring, ship inspection, etc. Specifications: Part name: reflective sheet Quantity: 100 Color: white Size: 20x0mm/30x30mm/40x40mm/50x50mm/60x60mm Material: acrylic Package contents: 100*reflectors Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.