Anyone having trouble with Salt test?

[waterbear]

Have you powered the unit off and then on? Sometimes that works. Give it about 48 hours with the pump circulating and brush the pool thoroughly to mix the salt during this time. If the SWG still reads low you have a problem somewhere with either improper installation or a defective unit. Call the manufacturer for help.

Pool store reading might have been off for several reasons. First and most likely is operator error in the test if it is a chemical test (including if they used a strip). Second and just as likely, if they used a meter it has not been calibrated recently.