Every maker, engineer, and DIYer has probably used a decent oscilloscope in the past. If you are looking for a oscilloscope that communicates with smartphones and tablets, you may want to give these units a look:
Oscium LogiScope: this 100 MHz 16 channel logic analyzer works with 2.0 to 5V systems. It is compatible with Lightning and 30-pin connectors.
Aeroscope: a wireless oscilloscope probe that lets you debug robots, drones, and circuits in their environment. The battery life lasts up to 8 hours. It has a wireless range of 200 feet.
Velleman WFS210 Digital Oscilloscope: a compact, portable battery powered two channel oscilloscope. It lets you view measurements on your iOS, Android, and Windows devices. It weighs 180g.
Have you found other smart oscilloscopes? Please share them here.