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A different correction factor may be required for high EC values compared to low EC values. It attempts to correlate Total Dissolved Solids (TDS) with conductivity. But because the conductivity depends upon exactly which "solids" are dissolved it can vary widely with different situations.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.