As I recall my old inca with a manual ground balance was fooled less on hot rocks than the auto-balancing DeLeon that I now own. It can be quite annoying. Is the sand shark with 3 1/2 turn potentiometer able to cope with hot rocks. I would like a durable dependable machine that I dont have to worry about getting wet. The quattro that I own is not fooled by hot rocks but I stuck the tip of my digging tool through the outer lens over the ## and I find that more annoying that digging up a hot rock. I am 15 minutes from 3 lakes but 2 hours from a salt beach helping me too choose tiger over sand shark. Since my quattro has 5, 10.5 & 16 inch coils a tiger shark with 8 inch coil should see a lot of use as long as it can contend with trash and hot rocks at the same time. My hope is that the shark would be my go to and the DeLeon relegated to loaner status. Please comment.