The DSO201 (also known as DSO Nano) is a pocket-sized, open-source digital storage oscilloscope featuring a 2.8-inch color display, a 200 kHz bandwidth, and a 1 MSa/s sampling rate. Weighing roughly 60 grams, it runs on a rechargeable lithium battery and is commonly used for basic electronics troubleshooting and DIY projects.
legacy wiki page - https://w.electrodragon.com/w/Portable_Digital_Oscilloscope_DSO201_Nano_V1
- user manual - fab-tools-dat/fab-tools-electronic-dat/Oscilloscope-dat/DSO201-dat/DS201V_4.22-User-Manual.pdf