If you want to detect the presence of metal around you, use the free Gold Detector app for Android. With a powerful magnetic sensor, it can detect any metal object in your room. It can also detect gold content or other related objects that are off the wall. 

If you want to know more about this amazing tool, read the review on the Play Store.

The best way to use the Gold Detector app is to open the app, select the type of metal you want to detect, and then tap on the sensor. You will get an answer in the form of a graph.