By going through the metal detector review you will be able to known in detail about the depth up to which the detector can sense various metals. Some of the detectors are having a capability of detecting certain metal objects which are as deep as 12 inches or so on. However, some other detectors can detect as well as find out the exact depth location of the metal. Hence depending on your requirement, you can choose a particular metal detector. The reviews will also provide you with enough information regarding the various detection modes. Usually detectors are having are four modes. They are relics (buttons, bullets, etc.), coins, prospecting and jewelry. Sometimes, you will need to use only a single detector; while in some other cases, you will have to use two modes together. When compared with the other modes, single mode is mostly chosen by various people and has attained better success too.