Here you can see an active tACS session. Valuable information is shown. The frequency is displayed (frequency is selectable due to the experiment protocols, various frequencies can lead to different effects on different areas on the brain). The time is always displayed in EVERY mode, whether timed or continuous, the "E" stand for "State", which says Active and Ramping Up, the ramp is 5 seconds, as you may know in most of common protocols, there is always a smooth ramp of the current delivering, going from zero to the set target. The SCALYo, is the value of the microcontroller DAC generating the sinusoidal waveform signal, this means, the amplitude. According to the desired current intensity, the amplitude of the sine wave will be adjusted by the constant current system to reach the desired set by the user. Here is a 1.5mA target and 1.5mA real-time measuring of 1.5mA flowing through the scalp. As said before, the PID tune-fine allows to not to exceed the overshoot or get wrong values/measurements.