Description
The Growlink Terralink provides reliable substrate monitoring — volumetric water content (VWC), electrical conductivity (EC), and temperature — direct from the root zone. Built with TDR (Time Domain Reflectometry) technology, Terralink gives growers a dependable read on what's actually happening in the substrate, cycle after cycle.
Why growers choose Terralink
- Accurate root zone monitoring: Measures VWC, EC, and temperature with dependable precision across most substrate types.
- Reliable in demanding conditions: Consistent performance through both high-EC feeds and aggressive dryback cycles.
- Growlink Copilot ready: Feeds substrate data straight into Growlink Copilot for automated crop steering.
- Easy installation: Push-in design with an M8 connector — no exposed wiring to thread through the canopy.
- Wide substrate compatibility: Works across most soil and soilless media (avoid mixes containing perlite or clay pebbles).
Technical Specifications
| Technology | Time-Domain Reflectometry (TDR) |
| VWC Range | 0–100%, ±3% accuracy |
| Bulk EC Range | 0–18,000 µS/cm, 1 µS/cm resolution |
| Temperature Range | -40 to +55°C, ±0.25°C accuracy |
| Dimensions | 7.25" x 2.25" x 1.75" |
| Cable | 2m, M8 connector, included |
| Compatible With | canopyLINK, LINKS HUB |
Need longer reach? Extend your Terralink cable with the M8 extension 5m cable.
Terralink vs. Terralink+
Want research-grade True EC and pore water EC on top of your VWC and temperature readings? Here's how the standard Terralink compares to Terralink+ with TrueEC™:
| Spec | Terralink | Terralink+ |
|---|---|---|
| EC Technology | Standard TDR | TrueEC™ (true dielectric) |
| Measurements | VWC, EC, Temperature | VWC, Bulk EC, Pore Water EC, Temperature, Permittivity |
| VWC Accuracy | ±3% | ±5% FS, 0.1% resolution |
| Bulk EC Range | 0–18,000 µS/cm | 0–6 dS/m (6,000 µS/cm) |
| Pore Water EC | Not available | 0–55 dS/m (Hilhorst model) |
| Cable | 2m, M8 connector | 5m or 10m, M8 connector |
| Best for | General substrate monitoring | Research-grade crop steering and multi-room precision setups |
Not sure what to buy first? Start with a kit.
Choose a starter kit based on what you want to automate first — every kit works together and expands over time.
Irrigation Starter Kit
For growers who want automated irrigation with root-zone visibility and climate monitoring.
- canopyLINK Sensor HUB — £299
- valveLINK Controller — £399
- Terralink Substrate Sensor x2 — £598
- Climalink Climate Sensor — £399
Bundle price: £1,376.95
Monitoring Starter Kit
For growers who want real-time climate and root-zone visibility before adding automation.
- canopyLINK Sensor HUB — £299
- Terralink Substrate Sensor — £299
- Climalink Climate Sensor — £399
Bundle price: £1,056.00
Part of the Growlink LINKS Ecosystem
LINKS is Growlink's modular grow-room hardware system: small, purpose-built devices that each do one job well, and click together into a whole-facility control network. Terralink handles substrate monitoring — VWC, EC, and temperature — plugging into canopyLINK or the HUB via its M8 connector to feed root-zone data straight into Growlink OS. Every LINKS device can run wirelessly on its own over Wi-Fi, but connecting to the HUB over a wired RJ-45 connection unlocks whole-room automation, longer signal range, and the ability for the HUB to power and enable additional LINKS hardware across the facility.
Explore the rest of the LINKS range
- canopyLINK Sensor HUB — connects up to 8 climate & substrate sensors
- valveLINK 8-Channel Irrigation Valve Controller — automated, sensor-triggered irrigation
- ClimaLINK Climate Sensor — aspirated temp, RH, VPD & light
- Terralink+ with TrueEC™ — research-grade TDR substrate sensing
- batch tankLINK — automated nutrient tank monitoring
- nutriLINK — 8-output precision nutrient delivery
- HUB 8-Port Communication Controller — wires the whole system together
- Digital lightLINK — dimming & spectrum control
- 4 Channel lightLINK — fan speed, dimming, 0–10V
Powered by Growlink OS
"Run cultivation from a system that learns."
Every Terralink connects into Growlink OS, the cultivation management portal that turns your best irrigation practices into living Blueprints — standardised schedules and automation logic you can roll out across every room. Growlink OS includes Nova, Growlink's built-in AI, which compares performance across rooms, flags deviations from plan, and answers questions about crop performance without you having to dig through spreadsheets.
Want the full methodology behind zone-based irrigation scheduling? Download Growlink's Precision Irrigation Playbook V21 (PDF).
