How to make Mobile Oscilloscope | Home made Oscilloscope | PWM | Oscilloscope DIY - YouTube
Loto USB Oscilloscope OSC482M for Both Android Phone/Tablet & Windows PC, 2 Channels, 50M S/s, 20MHz (Bandwidth), 8~13 bit Vertical Resolution: Amazon.com: Industrial & Scientific
USB Accessory Oscilloscope:Amazon.com:Appstore for Android