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What is the maximum current I should use?

It was not recommended to use currents above 2.0mA for tDCS. 

Go Flow and v2 are software limited to 2.0mA and hardware limited to 2.1mA maximum current.

Update: It has since been shown that higher levels can be tolerated and could bring benefit. 

One approach to potentially boost efficacy is increasing stimulation intensity from the conventional limit of 2 mA...provides initial evidence for the safety of tDCS intensities up to 4 mA.

Nitsche & Biksom

“Extending the parameter range for tDCS: Safety and tolerability of 4 mA stimulation”

Go Flow now has a maximum current limit of 4mA.