how to calibrate Conduct probe?

Just got a Profilux 3 but can't quite find where to calibrate the probes. Don't have a USB plugged in, only wifi.

Do I need to use a PC and USB direct connection to access the 'calibration' settings?

I have MyGHL setup on ipad, Expert mode--->Control--->Sensors--->Temp, pH, Conduct, Redox....

for Temp probe, there is a 'Calibration' function under Maintenance, BUT for all the others, pH, Redox and Conduct(salinity), under Maintenance, there is no 'Calibration'

You can do the calibration directly on ProfiLux 3 with the LC-Display and navigating to Sensors settings->Cond.(S/F)->Calibration.
Just 'Activate' the sensor before in the settings.