hi all having some issues setting up my kh director i purchased months ago spend a month to update the firmware now calibration issue cant get my ph calibration keep giving failed messages i had a look how to calibrate talking about saltwater and freshwater calibration kit mines came with freshwater kit is it OK to use on saltwater if is OK why there is 2 different kit ? And why keep failing had enough. I was thinking to buy ion director but now will think twice to buying it any help will be appreciated.