The model SME-2345 Bi-reflex targets are made of reflective sheets. These reflectors
can be fitted with threaded convergence bolt to mount the reflector at required direction in the tunnel or any other measuring locations. The reflector can be mounted at required distance in the tunnel. The distance by Electronic Distance Measuring unit can be measured from 15 m to 140 m. The Microprocessor based Electronics distance measuring unit along with its stand is being used to measure the distance as well as convergence of tunnel wall with the help of reflectors.