I think to take xp orx hf with an oval coil. attracts 80 kHz, for gold chains and other small things. Price $ 400, I do not want to regret if it breaks or gets lost. What do you think all the same to take with a coil up to 80 kHz or up to 60 kHz? Digging holes and walking through the bushes will certainly be more fun with an oval one.