Conductivity meters, available in benchtop or portable models, measure temperature and electrical conductivity of water or solutions. They can be used in hydroponics, aquaculture, aquaponics, and freshwater systems to monitor quantities of nutrients, salts or impurities. Get high accuracy, premium performance and ultimate flexibility with the Thermo Scientific™ Orion™ Versa Star Pro™ Conductivity Benchtop Meter. Record accurate and reliable conductivity, total dissolved solids (TDS), salinity, resistivity and temperature measurements with the Thermo Scientific™ Orion Star™ A222 Conductivity Portable Meter.