Diode lasers of the HD series are designed to withstand day-to-day use in harsh industrial environments. The waterproof stainless-steel housing protects the laser diode, electronic circuitry, and precision optics. The laser diode is galvanically isolated from the power supply, making the laser extremely resistant to voltage peaks and current variations. The wide-range input capacity allows the HD lasers to be used with all typical low-voltage power networks. The optics can be focused without tools. Spot size or line width can be adjusted, and the line position remains unchanged during focusing.