The T8 design has been perfected during more than 20 years of service. It is extremely robust, built to cope with the harsh tunnelling environment.
The alignment mechanism in each axis consists of two counter working precision thread alignment screws, that lock the laser position in place for maximum stability of the alignment. The 5/8” thread in the bottom allows for use of replaceable, precision instrument positioners. This gives the possibility of dismounting the instrument during blasts when working close to the work face.
The visibility of the T8 laser spot is excellent, making the T8 good for ranges up to 800m. The laser power output is 3,5mW (5mW as option). The laser beam is focused at 600m, which ensures that the laser spot diameter at 600m is typically 35mm.
The T8 is engineered for durability. Its thick-walled aluminium housing can take abuse. The optics are protected against blast rock damage by a thick optical glass, that is easy to replace in case of damage. The alignment mechanism is over-dimensioned to give further protection against damage. The T8 is fully water and dust proof, and is purged with nitrogen to avoid condensation on the optics.