How to determine the north and south pole of a magnet for free
Channel: Martin Fleischmann Memorial Project
Date: 2020-06-12

Ever wondered which pole is which on your magnets? Well, with this easy, free application, you can (WARNING, don't use on a smartphone you love, it may impair its operation)

Google Play Store
https://play.google.com/store/apps/details?id=air.de.supermagnete.magnetapp&hl=en

Alternative
https://totalelement.com/pages/magnetic-pole-detector-android-ios-app

You can also build a cheap kit.
https://www.fasttech.com/product/9707160-hall-magnetic-sensor-north-south-pole-detector

Here is a YouTube video tutorial
https://youtu.be/XTlNEJEcD6U