Portable TDS meters can be taken anywhere to measure water quality eg. Tap water, RO system water, aquarium, sea water, and pool water. Uses fully transparent liquid crystal (LCD) to display values 4 digits and corresponding physical units of size. This product can detect the salinity of edible salt. At the same time, it can detect the salt content of sea water. Food salinity measurement range 0.00-25.00% of salt range 10.1-200.0pm TDS , pH, salinkoctor, EC meter and temperature measurement are integrated. TDS measuring range: 0-1000PM, EC measuring range: 0-10000US / cm, pH Measuring range: 0.01-14.00 pH, salinometer Measuring range: 0.00-25.00%, depending on temperature conversion. Auto power off function turns off the power after 5 minutes without use to save power.