Hi, i'm new on that and i would know what metal detector is better to find on the water of the beach, y want it for seach coins and gold rings etc, Much people said to me buy a Pi metal detector like garret sea hunter mark, but that detects all metals and doesn't have discrimination, and others said the minelab excalibur II, but i don't know for that because if i would find gold i have to take in all metal model, can somebody help me? Sorry for my bad inglish i'm from spain.