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 (see the SpecSheet in “Manuals / Literature” for specific station limits)
  • WaterScout Calibration Device (Item 6470CAL3V) required unless using Soil Sensor Reader (Item 6466)


  • 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

Not compatible with 400/200 loggers.

WatchDog Stations sold prior to 2012 must be upgraded. (Call for support)

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