• Soil moisture/EC/temperature sensor

Soil moisture/EC/temperature sensor

WaterScout SMEC 300 Soil Moisture/EC/Temperature Sensor



Track soil moisture, salts, and soil temperature: all with a single sensor !

Whether it’s container pots in a greenhouse or turf on a putting green, the salinity of the root zone is a critical element for healthy plant growth.  Irrigation, fertilizers, and crop demand all impact salt concentrations.  High levels can damage the plant: low levels can lead to nutrient deficiencies.

Identify situations where soil salinity is an issue or where certain moisture and temperature conditions facilitate soil-borne diseases

  • Capacitance-type soil moisture sensor
  • Carbon ink electrodes provide large measuring surface for electrical conductivity (EC)
  • Easy, 1-step EC calibration process
  • Can be read with the FieldScout® Soil Sensor Reader (Item 6466) or WatchDog® 2000 and 1000 Series Stations
  • Connect up to 4 sensors per station
  • WaterScout Calibration Device (Item 6470CAL3V) required unless using Soil Sensor Reader (Item 6466)

Not compatible with 400/200 loggers. 


 WaterScout SM 100 Soil Moisture Sensor






Keeping track of your field’s soil moisture status allows you to better schedule irrigations and evaluate the effectiveness of rain and irrigation water. Regular monitoring will give you an accurate picture of this process over time. The SM100 combines affordability and accuracy into a sensor that is easy to install. The sensor is composed of two electrodes that function as a capacitor, with the surrounding soil serving as the dielectric. An 80 MHz oscillator drives the capacitor and a signal proportional to the soil’s dielectric permittivity is converted to an output signal that is then converted to volumetric water content. The SM100 is designed to be compatible with WatchDog® data loggers and weather stations. SpecWare software enables you view your data in graphical and tabular form as well as run reports customized to your application


Dimensions  2.4in (6cm) x 0.8in (2cm) x 0.1in (0.3cm)
Range  0% VWC to saturation
Resolution  0.1% VWC
Accuracy 3% VWC @ EC < 8 mS/cm
Cable Length 6 and 20ft. extendable up to 100ft
Power Requirements  3 to 5V @ 6 to 10mA
Output  Analog voltage proportional to excitation voltage (0.5 to 1.5 V for a 3V excitation)
Sensing Area 2.25 in. x 0.75 in.
Oscillator frequency 80 MHz  
Connector 2.5mm stereo pin
Temperature 33 - 175°F (0.5 - 80°C)
Calibration Sensors with 3/14 code can be re-calibrated using the FieldScout Soil Sensor Reader 





Cat No.  
FieldScout Soil Sensor Reader SP6466-000
Watch dog Station Series 1000
WaterScout SMEC 300 Sensor - 6ft SP647006-00
WaterScout SMEC 300 Sensor - 20ft SP647020-0
WaterScout SM 100- 6ft SP6460-000



WaterScout Calibration Device SP6470CAL3V
Standard Interface WatchDog station, FieldScout soil moisture reader
Range VWC: 0% VWC to saturation, EC: 0 to 10 mS/cm, Temp: 33 - 175°F (0.5 - 80°C)
Resolution VWC: 0.1%, EC: 0.01 mS/cm, Temp: 0.1°F (0.1°C)
Accuracy VWC: 3%, EC: ± 2%, Temp: ± 1.4°F (0.8°C)
Cable Length 6 ft (1.8 m) and 20 ft (6 m) standard, extendable up to 50 ft (15 m)
Power Requirements 3V @ 6 to 10 mA
Output Analog voltage, time division multiplexed
Sensing Area 2.25 in. x 0.75 in.