I took my gold bug to the river today were their is gold. I took my biggest peice of gold with me to test it out in a few diffrent spots. First I GB the machain and got it set up to about 45 gain, and O in thershold. It would barly get 2 inches in depth on the peice of gold.. If anyone is going to buy a detector for gold.. I earge you not to by a fisher. They suck balls. Also with the hot rocks it has no brain to cancel them out what so ever. ( ) <-------------- That was about the size of my gold nugget I brought today. I could see if I was able to get five or six inches, but 2 at most and it has no way to tell the diffrence between hot rocks and the gold. It makes the same sound , and the bar on top of the screen wont move unless the coil is put right on top of the gold nugget. Its the slowest peice of crud. it needs some help. It can still get a good target on nails, bottle caps, wire, but gold no way, its the worst. Its like its got a block on it for gold. WTF.... Some of the singels i did practicing on my gold, it would even miss on some swings. I just don't have time to mess with this test dummy detector....