A multimeter is our main tool, but sometimes in the worst moment of a reparation of a design....you need a good oscilloscope.
We have an Aliexpress DIY 1 channel low-quality oscilloscope....we will review your model so hard for you! :)
Here is our project:
www.academiadeinventores.com RS could be a collaborator of this new academy. We want to have a lot of them around Spain.