Multifunctional 5-in-1 water quality tester measures pH, TDS, EC, salinity and temperature. It features high performance, high pen shape, fast numerical stability and accurate calculation result. IP67 waterproof, this meter can still be used when dropping 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 measuring range is 10.1 to 200 ppm. 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%.