Here is a multitool made for DIY electronics projects. The QUARK is ready for Arduino, ESP32, and STM32 projects. It It can connect to iOS and Android devices and has a color screen with 240 x 135px resolution. You can use Quark to measure voltage, current, resistance, capacitance, and inductance.
This device can also work as a oscilloscope with a sample rate of 400 Khz. It has a UART logger/plotter and signal generator. It lasts up to 5 hours on battery and is charged with a USB Type-C connection. While you can connect it to your phone, the QUARK also works standalone.