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The water quality test pen is a 7 in 1 style. Salinity Salinity: 0.01-20.00%; suitable intake salinity value for human body is 0.900%. ORP Negative Potential : ±1999MV. TDS Value: 0-200000ppm/10.1-200.0ppm.
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.