Measuring voltage with a multimeter is easy enough, and current is a bit harder, but reading both values simultaneously can be a challenge. If you’re tired of having to replug or find two meters, then look no further than Karl Kristian Torp’s palm-sized Tiny V/A. 

His Arduino Nano-based unit takes input from a power supply via a female barrel jack connector. This supplies the load through a male connector output, and also powers the Arduino, an IN219 sensor, and a 0.96” OLED display. Everything is housed inside a 3D-printed case.

A single capacitive touch button allows you to easily navigate Tiny V/A’s menu and change the settings. Additionally, it can be powered over USB as needed for an expanded voltage range.

More details on the project are available in Torp’s Instructables post.