Deleted member 7446
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I would strongly recommend getting an industry standard TDS tester even if you consider it as a spare and also to cross reference your test resultsTds meter im using is one that i got with my di version so probably not the best.
Many cheap amazon, Ebay and bundled package deals don't include quality testers.
Here's a link for Daqua, Doug supports and adds great advice to this page so supporting him with a purchase is worth it.
This is what to look for
https://www.daqua.co.uk/testmeters.htm