East to use reflective target, attaches directly to object being monitored, great for bridges, walls, antenna masts, dams and other fixed objects where retrieving prism can be difficult to retrieve or for contentious monitoring.   TPI Reflective targets are supplied on adhesive backed sheets that can be directly affixed to measuring points. Works great as an alternative to a standard prism or mini prism. 0.5mm thin, self-adhesive that adhere to almost any dry surface. Works with all total station, reflector-less or not. 
 2 3/8" X   2 3/8" REFLECTIVE TARGETS
Sold in Sets of 10