Raspberry Pi Pico Oscilloscope for your Smart Phone or Tablet, Scoppy Oscilloscope
USB Oscilloscope 2 Channel 50MS/s 20M Bandwidth For Android /Tablet PC OSC482M | eBay
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
2CH 110MHz Tablet Oscilloscope 250MSa/S 7'' Touch Screen 8MDepth Fast Charge USB | eBay
PeakTech 1212 - Tablet Oscilloscope, 100 MHz, 4 Channels, 1 GS/s with Multimeter 4½ digits (19999), LAN and USB Interfaces