YSI EcoSense EC300A [606079] Conductivity, Salinity, TDS, Temperature Meter without Probe. The YSI EcoSense EC300A Conductivity / Temperature Meter provides the most accurate data in the most affordable format. The instruments feature an easy-to-use interface, one-hand operation, IP67 waterproof case, and low cost of ownership over the life of the product. The EC300A is designed for quick, accurate results in an economical platform. The ability to measure conductivity, salinity, TDS and temperature in a simple, compact handheld allows the instrument to be used across multiple application sampling strategies. With a one-year instrument and electrode warranty, waterproof case and ease-of-use, the EC300A will fit your needs.