Id change it to milisiemens only if you can or else idk who is gonna know what ur numbers are when asking for help on something. I never heard of microsiemens lol.
Thatd be fustrating. I just use the hanna ec meter, my only complaint is put the calibration button somewhere else. If you press it you must calibrate it which is a waste of solution if it was by mistake. Its right next to power button which sucks.