Thread: Oscilloscope
Here is a simple stand alone DIY oscilloscope from China that was easy to assemble and works well. It costs about $25 including housing and shipment. It works well with my modular rack so I could really recommend it.
https://m.banggood.com/Original-JYETech-DSO138-DIY-Digital-Oscilloscope-Kit-SMD-Soldered-13803K-Version-With-Housing-p-1051616.html