Metal Detecting: Using a pinpointer under water Bullseye TRX at Three Rivers, CA

I put the Bullseye TRX under a test while metal detecting near the river and in the river at Three Rivers, California. I was very nervous to take something electronic and put it in the water. For all intents and purposes, I was forcing myself to face a fear of losing $100. The Bullseye TRX brand new sells for $150. I got mine off of eBay on an "Or Best Offer" auction for $100. Still, to me, $100 is a lot of money and I really feared I&have to call it scrap if I put it under. Fortunately, I faced my fears and put the thing in the water and found it did work well under water. YAY! I&since used it under up to 2 feet of water in a freshwater river near Fresno, CA as well. It seemed to get water inside, so here&my suggestion: White&made it easy to interchange cases with this pinpointer so you could just replace the case but keep the internals. If you are going to use this under water after many hours of use, you may find that pushing the button on the side under water may force tiny holes (through much wear and tear) to open, and thus allowing water to go inside. With the ability to open up the case and remove the internal circuitry and hardware, my plan is to either silicone the circuit board or use a glue gun to cover the all but the battery terminal. This way, if water does get in, the glue/silicone will have prevented any entry of water into the most sensitive part of the device. My finds were not amazing, but learning that I could use the TRX underwater was a huge...