100 pieces of reflective tape do tunnel engineering purposes, tilt monitoring 3 cm x 3 cm Description: Feature: Fast positioning za using all popular measuring instruments. Long-term monitoring of bridges and buildings: measurements and facades, even in corners, moving heights and axes around corners and from the inside to the outside, can be installed even on difficult surfaces. Reflective Sight Sheets: The crosses are printed on the back plate below the center of the glare for lasting measurement marking. If the glare is damaged, it can be easily replaced. The original measuring point can be restored quickly, easily and inexpensively. Application: tunnel engineering, bridge engineering, building construction, slope monitoring, ship inspection, etc. Material: made of acrylic material. The package includes: 100 reflective target sheets