Digital 5 in 1 Water Tester. Tests for EC/TDS/S.G/SALT/TEMP LCD Water Quality meter for Drinking Water. EC: Electrical conductivity (EC) is a measurement of water's ability to conduct electricity. EC is related to water temperature and the total concentration, mobility, valence and relative concentration of ions. Generally speaking, higher EC means more electrolytes in the water. TDS: TOTAL DISSOLVED SOLVENTS in the water. S.G: SPECIFIC GRAVITY (S.G.) Specific Gravity, or relative density, is expressed as the ratio of the density of seawater relative to the density of the same volume of pure water. SALT: Salinity refers to how much dissolved salts are in the water. This measurement is typically expressed in percentage or parts per thousand. TEMP: Water temperature is critical because it is an important quality in environmental parameters. It is important to measure water temperature. Other attributes Product name Water Tester Temp 0C-50"C(32°F-122°F) Battery 4*1.5V Weight 110g Size 250mm*45mm*45mm EC/TDS/SALT +/-2% TEMP +/-1.0 C Display LCD Model AWBT785 Feature Packaging and delivery Single package size: 30X50X50 cm Single gross weight: 0.150 kg Warranty 1 year Please Note: We are selling this product without the Bluetooth function. If you are able to set it up. that's a bonus.