Matek F405 current monitor

Matek F405 minite doesn’t have build in current sensor. Alot of small esc doesn’t have it as well. I need a current sensor for a specific task to test crusing speed. After that I don’t need anymore. Anyone knows what kind of signal this input?
Is it a 5v variable voltage signal?
I thinking of buying a current monitor module.

3v3 ADC

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Thanks. Only 3.3v… I assume its the same for all other esc?

Common to most autopilot and ESC architectures.

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