SWG reading vs salt test strips

Strips can be off by 500ppm +/-
The k1766 by 200ppm +/-
The cell salinty reading will likely never match the actual salinity level in the pool exactly . They are simply measured differently.
The closest the unit will ever be to actual salinity is when the cell is new and it will go down over time .
As Pat said- if the cell is happily producing & you’re measurements are fairly close you’re good to go.
Here’s more info on the unit you have
 
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