1. When the laser tube is working, it must be cooled by water
2. The positive and negative ends of the high-voltage output and the positive and negative ends of the laser must be correctly connected
3. There is still residual voltage after the power is cut off, please discharge the residual voltage first, and first touch the positive pole with a grounded wire
4. The power supply must use a three-hole socket with a grounding terminal, and the chassis must be strictly grounded to avoid electric shock