When precision irrigation decisions count, the Field Scout TDR Series offers growers a tool to eliminate the guesswork. Based on proven time-domain measurement technology, these portable units accurately measure soil moisture across the full range of soil moisture conditions. Select from the 3.8*, 7.5, 12 or 20-cm (1.5*, 3, 4.8 or 8-inch) probe rods to suit your desired depth measurement. Install PVC access tubes and take readings deeper in the soil profile.

The TDR 300 has two volumetric water content modes; one for standard soils and one for higher clay soils. In volumetric water content (VWC) mode, the meter converts a measured electrical signal into percent soil moisture content using an equation valid over a wide range of mineral soils. In irrigation mode, the meter displays a relative water content (RWC) on a scale of 0 to 100 corresponding to a user-defined upper and lower soil moisture reference level. Water deficit, the amount of water needed to bring the soil moisture content up to the upper reference level, is also calculated and displayed. The reference levels are easily programmed into the meter with the accompanying software. Create up to 2 management sites based on your soil types and crop needs. Use the raw reading mode (measurement period in microseconds) to do soil-specific calibrations.

Perfect for Researchers and Consultants! An internal data logger and RS-232 port allow for use with a DGPS for geo-referenced soil moisture measurements. Includes software and PC cable.

Use the powerful SpecMaps online application to discover the value of spatially variable sensor measurements. Mapping software requires GPS; not included.

* 3.8 cm (1.5") rods may require a TDR 300 firmware update. Please contact us for instructions.

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Measurement rods must be purchased seperately for Field Scout TDR products.

Click to view the TDR 300 Soil Moisture Meter user manual.
Click here to view a water holding capacity by soil type comparison.

Related Links: Specmaps / TDR 300 system brochure

Garmin GPS 72 Handheld GPS Navigator The GPS 72 is a low-cost solution designed to provide precise GPS positioning using correction data obtained from the Wide Area Augmentation System (WAAS). The GPS 72 can provide position accuracy to less than three meters when receiving WAAS corrections. This rugged, waterproof, unsinkable GPS receiver offers a large, 4-level grayscale screen. It's designed as the next generation in basic, entry-level Garmin GPS.

7250 - Optional GPS Mounting Bracket The Spectrum GPS Mounting Bracket allows users of the Field Scout TDR300 soil moisture meter the ability to connect a GPS receiver to the device and keep both hands free to insert the probe into the soil.  The bracket is designed to accommodate several possible GPS receiver antennas.