"True time domain sensors have been very expensive in the past, which is why they have not been much used other than in agricultural and environmental science. The relatively inexpensive ($100’s) sensors that were purported to be TDR sensors in the past, were not true time domain sensors. New, relatively inexpensive true time domain sensors are now available in the market (Acclima TDR-315 and ACC-TDT)." --USDA Presentation: Soil Water Sensors for Agriculture

  Acclima Products

SDI-12 Sensor Reader Kit

Acclima Sensor Reader Kit (SDI-12)

This kit contains the Acclima Sensor Reader which will read any Acclima SDI-12 soil sensor, display the readings, and (if it's a 'Waveform Capture' sensor) it will record and display the waveform. The kit comes with a rugged carrying case, a 32 GB thumb drive, a TDR-315L sensor with Waveform Capture and terminated with an M12 connector, and an international power adapter kit for charging the unit.

Sensor ReaderAcclima SDI-12 Sensor Reader User Guide

Latest SnapView Firmware UpgradeLatest Acclima Sensor Reader Firmware Update -- ACEFW_20_1_4_4.WAF, November 7, 2019

Sensor ReaderUpgrading Firmware For the Acclima Sensor Reader or For Sensors Connected to the Reader


True TDR-315H (SDI-12)

A fully integrated TDR, the 315H consumes a fraction of the energy than that of its predecessor, but still maintains a 150 pico-second rise time for superb accuracy.

TDR-315HTDR-315H Data Sheet

TDR ManualTDR-315H User Manual

TDR Charaterization ReportAcclima-TDR-315H-Characterization-PrelimReport12-18-2019.pdf

True TDR-310H

True TDR-310H (SDI-12) with rounded form factor

This TDR is from the same family of the other Acclima True TDRs, however its rounded form factor allows it to easily attached to a (schedule 40) 1" PCV pipe and/or be inserted into an access tube as small as 1.25" (schedule 40 PVC) to be inserted into the soil at a specified depth.

TDR-310H Soil Moisture Sensor True TDR-310H Data Sheet

TDR-310H Soil Moisture Sensor Acclima True TDR-310H User Manual


True TDR-305H (SDI-12)

Completely intergrated TDR accurately yields VWC and BEC/PWEC with a high-speed 150 pico-second rise time for a detailed wave form analysis. Designed for high EC tolerance when taking readings.

TDR-315TDR-305 Data Sheet (coming soon!)

TDR-315True TDR-305 User Manual

DataSnap Data Logger

DataSnap Data Logger (SDI-12)

Portable SDI-12 mini data recorder. Takes over 53,000 5-datapoint scans before it overwrites the oldest data. A/B USB cable included. Battery pack requires 8 AA batteries. AC/DC universal adapter is also included.

DataSnap Data RecorderDataSnap Fact Sheet

DataSnap user manualDataSnap User Manual

Free SnapView SoftwareSnapView Software Setup (version 1.3.2-Updated February 6, 2020) for Windows PCs

Latest SnapView Firmware UpgradeLatest SnapView Firmware Upgrade ACFW_19_2_2_4.WAF updated February 6, 2020

Latest SnapView Firmware UpgradeInstructions for applying DataSnap firmware upgrade >>ACFW_19_2_2_4.WAF

Standard TDT Sensor

TDT Soil Moisture Sensor (SDI-12)

Also used worldwide, this TDT sensor accurately measures VWC, Bulk EC, and temperature. Temperature accuracy is within 0.5˚C.

TDT Soil Moisture SensorSDI-12 TDT Soil Moisture Sensor Data Sheet

TDT User ManualStandard TDT User Manual