If the $20 worked as well as the $200 ... who would buy the expensive one :lol:
Just curious why you are thinking of getting one? As long as the SWG is happy, then things are fine. It is good to double check independently, but the cheaper drop based salt test is plenty accurate enough and requires no calibration. Or many people just use the salt strips.
The electronic meters all drift and need to be re-calibrated frequently, even the expensive ones. If you are measuring salt levels several times a day, that can be worth the effort, but for residential use it isn't.
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