A full version app for Android, by closeupapps.

Hidden Device Detector: Camera & Microphones is an Android app that lets you detect hidden devices such as cameras and microphones by measuring magnetic field intensity. If you are concerned that there might be bugs or spyware somewhere around you, this app is a great tool to detect them.

To use this app, first, you need to download it on your Android device. After that, you need to place your phone near the place you think might have bugs. This app will then detect the magnetic field intensity and show you the results. 

It is very easy to use and understand, and you don’t have to be a computer expert to use it.