这个很难说，要根据当地的实际环境来定。因为地下金属探测器的实验深度是一块60公分的铝块，埋在干燥的地下得出的探测深度结果。
It's hard to say that it should be decided according to the local actual environment. Because the experimental depth of the underground metal detector is a 60 cm piece of aluminum, buried in a dry ground to obtain the detection depth results.
如果当地的土质潮湿，或者含水量大的话效果会减弱。还有就是要看探测物体的大小，一般来说被探测的物体越大就越容易被探测到，反之亦然。
If the local soil is wet or water content is large, the effect will be weakened. There is also the size of the object to be detected, generally speaking, the larger the object to be detected, the easier it is to be detected, and vice versa.
其实最最主要的还是看使用者的经验如何！
In fact, the most important thing is to see the user's experience.
不能买回去就想探到宝藏，这需要一个不断学习和熟悉的过程，天上没有会掉的馅饼，供这个工具只是辅助你，不可以完全依赖。如果太依赖机械的话就会让你觉得这东西不好用，探测深度不够。
If you can't buy it back, you want to explore the treasure. It takes a process of constant learning and familiarity. There is no pie in the sky that will fall off. This tool is only for you, and you can't rely entirely on it. If you rely too much on machinery, it will make you feel that it is not easy to use and the depth of detection is not enough.