In this tutorial, we learn how to use the DSO138 digital oscilloscope kit. These are its features. If you want to learn how to use it, please watch this tutorial. If you want to learn how to do the acrylic case assembly, please see this tutorial.

You don't need a signal generator to test the oscilloscope. There is a test point with a 1kHz square wave signal on the scope; test and view the signal. See the image here.