- Model TDR 300 - Turf Soil Moisture Meters



These meters provide instantaneous readings of root zone soil moisture. They are 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 4.8 or 8-inch (12 or 20-cm) probe rods to suit your desired depth measurement.


TDR 300 Meters connect to any GPS receiver with serial output.* It is equipped with internal data logger and RS-232 port, and can record 3,250 measurements (1,350 with added GPS/DGPS options). You can configure and download meter with the included software. It is also compatible with SpecMaps online web-mapping application. This model also 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.

The TDR 100 provides instantaneous readings of root zone soil moisture, and is ideal for measuring containers. The probe block comes with a 5-foot (1.5m) cable. This unique model combines a compact handheld display connected to a sophisticated soil water sensing probe. It is designed for easy transportation without data logging capability or geo-referenced measurements.

The TDR 300 Turf Soil Moisture Meter Kit includes the TDR 300 meter, an AMS Turf Probe, two 4.8in SST Rods, two 8.0in SST Rods, and a soft-sided carrying case.

TDR Rods are sold separately.

*GPS interface requires two cables. The GPS/DGPS cable (item 2950CV5) is available from Spectrum. A PC serial interface cable supplied by the manufacturer of the GPS receiver is also required.

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