The SLM-635S medium range laser system has recently undergone a slight revamp to improve performance. The collimating optics have been improved to better define the spot at 200 metres, which has simultaneously made the laser head a few millimetres longer and improved the beam steering adjustment . The SLM-635S laser head is also now available in both a Class 2 (1mW) and Class 3R (5mW) versions, with the same reliable smart laser control and protection electronics, high temperature epoxies, ART trade-craft hex shapes, and removable Intrinsically Safe battery modules.
The SLM-635S laser head is also available with a fixed battery system, defining it as an SLX-635S (replacement for the old SLX-635P laser). This is a direct replacement for the lower specification LD-25 and LD-35 systems. The Class 3R SLM-635S system is equivalent in performance to the LD-60IS laser unit, but at a fraction of the price.
The SLM-635S laser system requires the following components:
- SLM-635S laser head
- BB-3C Intrinsically Safe battery module
- SLX-XY(R) laser adjustment mount.

