The YSI EcoSense pH/EC1030A pH and Conductivity Pen is designed for quick, accurate results in an economical platform. The pH/EC1030A is the perfect instrument for spot sampling of pH, conductivity, total dissolved solids (TDS), salinity and temperature in applications such as wastewater, surface water, aquaculture, hydroponics, pools, and education. The pH/EC1030A is a reusable pen-style instrument. The pH and conductivity electrode is easy to replace while keeping the instrument. It features an easy-to-use graphic interface, simple one-hand operation, memory, and low cost of ownership over the life of the product.