SDI-12 Digital tdt Sensor

The Acclima Digital TDT® Soil Moisture Sensor represents a revolutionary advance in the irrigation industry and is now available as a research tool. Calibration-free accuracy & stability.

Data Captured:

  1. Absolute volumetric water content (% VWC)

  2. Soil Temperature

  3. Soil Conductivity

  4. Soil Permittivity


Revolutionary Technology

The digital soil moisture sensor is a very effective tool to log moisture data for a variety of applications.

It is the first moisture sensor to incorporate the accuracy of digitized Time Domain Transmissometry in a low-cost instrument, providing highly accurate absolute readings of soil moisture under all conditions of temperature and soil chemistry under which crops will grow.



  • Absolute VWC accuracy ±2%

  • Operates in all soils

  • Large 100 ml soil sample volume

  • No maintenance, simple installation

  • 316 stainless steel construction 20+ years life

  • Moisture readings remain stable with changes in salinity, soil chemistry and temperature.

Electrical Specifications:
SDI-12 Protocol
Operating Temperature Range 33°F to 122°F (0.5°C to 50°C)
Survival Temperature Range: -31°F to 176°F (-35°C to 80°C)

Durable housing and waterproof epoxy construction
Width: 2 1/8" (5.4 cm)
Height: 9/16" (1.4 cm)
Length: 8" (20.3 cm)
Wire Length: 10m flexible sheathed