Rain Bird ClimateMinder GS3 sensor measures soil moisture, temperature and electrical conductivity (EC) at the depth it is inserted. It has a rugged construction which uses an epoxy body and stainless steel needles. The GS3 measures water content, temperature, and EC independently. Its 70 MHz frequency minimizes salinity and textural effects, making it accurate in most soil or soilless media. Stainless steel needles have an extended surface area to optimize EC measurements, while minimizing substrate disturbance during insertion. Temperature is measured with an onboard thermistor, and electrical conductivity is measured using a stainless steel electrode array.