Multifunctional 5-in-1 water quality tester measures pH, TDS, EC, salinity and temperature. It features performance high, pen shape, fast numerical stability and accurate calculation result. IP67 waterproof, this meter can still be used when drop in the aquarium, convenient to use. Replaceable probe, automatic calibration and high reliability, easy to use. Salinity can be measured . The salinity of seawater is the ratio of total dissolved solids to the weight of sea salt in seawater. It is usually expressed in g/kg of seawater, and the measurement range is 10 ,1 to 200ppm. Light salt refers to light water with a salt content of less than 0.5g/L. The measurement range is 0.00-25.00%, and the accuracy is 0.01-5.00 %, 5.10 to 25.00%.