Here is useful info for Zoom cloud meeting app users.
This useful tool uses the magnetic sensor built into your mobile device and indicates the level of magnetic field in uT (microtesla). The level of magnetic field (EMF) in nature is around 49μT (micro tesla) or 490 mg (milligauss); 1μT = 10mG. If any metal is close, the value of the magnetic field will increase.
Metal detector can identify a metal object in the area, because all metals generate a magnetic field which force can be measured using this tool.

The application provides info on the latest update now includes graphs of the price of gold for each national currency, as well as rulers of gold and silver prices in real time for each national currency in large print.

It is not an official Detector app, but always complies with the terms and conditions and content policy of Metal Detector.