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When capacitance stops being reliable, TDR takes over.

Terralink+ with TrueEC™

$299.00
$299.00
Shipping calculated at checkout.
Measures soil moisture and EC for precision irrigation decisions.Terralink Substrate Sensor
Terralink Substrate Sensor
$299.00
$299.00
Real-time substrate intelligence

Control-grade moisture and EC data for cannabis crop steering

TerraLINK+ measures substrate moisture in real time using Time Domain Reflectometry (TDR), delivering stable readings in EC-heavy environments so you can steer with confidence from early veg through late flower.

TDR measurement
Real-time updates
High EC stability
Co-Pilot ready
TDR measurement
Measures via signal timing across the probe, not inferred field distortion.
Real-time updates
See irrigation response as it happens, not minutes later.
Stable in high EC
Built for salts and nutrients that increase over the run.
Built for Co-Pilot
Real-time substrate signal that powers smarter steering suggestions.

Why some moisture data looks fine until it doesn’t

A common approach in substrate sensing estimates moisture from changes in an electric field near the probe. Early in a run it can look stable and predictable.

As nutrient strength rises, the environment becomes more electrically complex. Slower updates and averaging can blur irrigation events and soften dryback edges.

The problem is decision timing.
If you only see updates every few minutes, you can miss the moment irrigation should stop or the moment a dryback inflects. That’s where consistency gets lost.
TDR signal diagram
TDR signal diagram
Replace with a simple visual showing signal travel time through the probe.

Real-time data vs 3-minute resolution

Update speed changes what you can control. Real-time lets you steer. Interval data forces you to react.

Interval-based
Delayed
Event shows up late

Fast changes get averaged between samples. Dryback edges soften.

TerraLINK+ real time
Instant
Event visible instantly Dryback edge

See irrigation response as it happens. Tune timing with confidence.

Real-time data is the foundation for repeatable crop steering.
When you can see events immediately, you can refine strategy run by run and lock in consistency across rooms and facilities.

Works with Co-Pilot

Co-Pilot surfaces insights and provides suggestions to improve your crop steering strategy at every stage of the run.

It’s constantly learning from outcomes, so ensure your next harvest is always your best.

Stage-aware guidance
Recommendations tailored to each phase of the cycle.
Actionable insights
Targets, drift, and next steps to improve steering.
Learns over time
Improves suggestions as it learns what works in your facility.
Built for outcomes
Turns real-time data into decisions you can act on.
Co-Pilot screenshot
Co-Pilot screenshot

Measurement comparison

Two measurement classes. One estimates moisture from field changes. The other measures via signal timing across the probe.

Dimension Field-based estimation TerraLINK+ (TDR)
Measurement Electric field response Signal travel time
Update speed Often interval based Real time
Sensitivity to nutrient strength Higher Very low
Late run confidence Can degrade Stable
If EC changes your moisture reading, the measurement is being influenced.
TerraLINK+ is designed to keep the moisture signal stable so strategy adjustments are based on the crop, not noise.
Specifications

Measurement performance

Parameter Min Max Units
Relative permittivity
Range 1 100 –
Resolution 0.1 – –
Accuracy -2 +2 %FS[1]
Stability with Bulk Electrical Conductivity (0–3000 µS/cm) -1 +1 %FS
Volumetric water content (VWC)
Range[2] 0 100 %
Resolution 0.1 – %
Repeatability (RMS deviation) 0.3 – %
Accuracy -2.5 +2.5 %FS
Stability with Bulk Electrical Conductivity (0–4500 µS/cm) -1 +1 %FS
Temperature[3]
Range -40 +55 °C
Resolution 0.1 – °C
Repeatability (RMS deviation) 0.01 – °C
Accuracy (+5 to +35 °C) -0.25 +0.25 °C
Accuracy (-15 to +55 °C) -0.5 +0.5 °C
Pore Water EC (ECpw)
Range 0 15 dS/m
Resolution 1 – µS/cm
Repeatability (RMS deviation) 3 – µS/cm
Accuracy 2.5 5 %
[1] Percent full scale, i.e., +/- 2 percentage points.
[2] VWC is calculated from relative permittivity using a Topp-derived formula with modifications for slurries and pure water.
[3] Temperature performance applies within stated ranges.

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