Description: This is a 5-in-1 multifunctional water quality testing pen that can measure pH, TDS solubility, EC conductivity, salinity, and temperature. It is an IP67 waterproof water quality testing pen that integrates five functions. Replaceable probe, delivery of calibration powder package, automatic calibration at 3 o'clock. Measurable Salinity (Sea Salt/Freshwater Salt): Sea Salt: The salinity of sea water is the ratio of total dissolved solids to the weight of sea salt in sea water, usually expressed in grams per kilogram of sea water. (Measurement range: 10.1-200.0 ppt) Freshwater Salt: Water with a salt content less than 0.5g/L (measurement range: 0.00-25.00%, accuracy: 0.01%-5.00%, 5.10%-25.00%).
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