I would like to pass along my experience with Tesoro's service dept. I recently found a 1937 canadian penny, and in my excitement I laid my Golden Umax down. I had my pinpointer in my hand and looking at the date on the penny I dropped the pinpointer, it hit my threshold knob breaking it off. I called Tesoro and they said send it in. When I got it back they had sent a new battery cover tuned it up and put a new knob on it at no charge. I called them to explain that the machine was doing it's job it was the operator that messed up. They said lifetime warranty!! NO CHARGE!!! Try that with a White's or Minelab. What a great experience. Shorty2