Rough but effective It takes nerve to work but low voltage is nothing to be afraid of Not intended for the layman but for the price you can. I've never used it, but I found out. I use it on the highest settings (red light on) and it gets hot, but haven't blown it yet. I would buy it again or have it repaired. Probably reinforce it with heavier FETs and conductors and better spot weld probes.