I posted back on Dec 20th that I got my Detector back from Fisher and how I thought the service was great. Well I didn't used it for 10 minutes and the problem started again. I called and talked to Daniel and Felix, they said no problem, we guarantee all repairs. Felix sent me a prepaid address label and I sent it in. Got it back Monday they replaced the threshold pot. I finally got to run it for a couple hours yesterday and it looks like they got it this time around. I'm in the marine service business and sometimes we don't resolve a problem the first round, but we take care of the customer and make it right. I'm pleased to know Fisher is the same. Thanks Felix and Daniel.