The WET sensor is easily inserted into substrates, composts and most soils, and In just 5 seconds it measures three crucial variables that influence plant growth: water content, temperature and electrical conductivity (a strong indicator of nutrient levels). The WET Sensor has crucial applications in precision horticulture and soil science research and is exceptional in its ability to measure pore water conductivity (ECp), the EC of the water that is available to the plant. WET Sensors are normally ordered as a complete kit that includes a WET Sensor, an HH2 instant readout meter and a handy carry case.