The Hydra Probe II (Stevens Water Monitoring Systems, Inc.) features a “dielectric impedance” measurement principle and it can be used with the EGM-5 for accurate measurement of soil moisture and soil temperature from a single probe.
Soil Moisture Range
– 0-100% (dry to fully saturated)
Soil Temperature Range
– Range: -10-55 oC
– Accuracy: ± 0.3 oC at 25 oC