An oscilloscope is a test instrument that captures and displays the behavior of electrical signals over time. You can see the peaks and straight lines depending on when the LED toggles on and off.
A multimeter is a tool used to check electricity in a circuit. A multimeter can measure voltage, resistance, and current. We connected an LED to a Pico and measured the voltage. The measurements are displayed on the screen. You can see the values ranging from 0–1 when the LED toggles on and off.