Growlink LINKS Terralink+ with TrueEC™

The Growlink LINKS Terralink+ with TrueEC™ is a research-grade TDR substrate sensor built for growers who need root-zone data they can actually trust. It measures volumetric water content (VWC), bulk EC, pore water EC, temperature, and permittivity from a single probe, using true dielectric EC measurement rather than the capacitance-based estimates found in most substrate sensors. Why growers choose Terralink+ TrueEC™ technology: True dielectric EC measurement, not a capacitance-based estimate, for genuinely reliable readings through aggressive drybacks and high-EC feeds. Full TDR accuracy: Time Domain Reflectometry gives research-grade moisture readings rather than the simplified capacitance sensing used in lower-cost substrate probes. Five measurements from one probe: VWC, bulk EC, pore water EC, temperature, and permittivity all from a single 3-element stainless steel waveguide. Growlink Copilot ready: Feeds directly into Growlink Copilot for automated, data-driven crop steering decisions. Built to last: 316 stainless steel waveguide construction designed for repeated insertion across multiple grow cycles. Technical Specifications Measurements VWC, Bulk EC, Pore Water EC, Temperature, Permittivity Technology True TDR (Time Domain Reflectometry) VWC Range 0–100%, ±5% FS accuracy, 0.1% resolution Bulk EC Range 0–6 dS/m (6,000 µS/cm), 1 µS/cm resolution Pore Water EC 0–55 dS/m (Hilhorst model) Permittivity Range 1–85, 0.1 resolution, ±4% FS accuracy Temperature Range -40 to +55°C, ±0.25°C (5–35°C), ±0.5°C (full range) Waveguide 3-element, 5cm, 316 stainless steel Operating Temp -30 to +55°C Power 4.2–15V DC, <10µA idle, 118mA read Interface SDI-12 V1.4 Dimensions 15cm x 3.3cm (without cable) Weight 121g (without cable) Cable Length 5m or 10m (included) Construction 316 stainless steel, epoxy, ABS plastic Connector M8 Compatible With canopyLINK, LINKS HUB Substrate Types Rockwool, coco, peat, soil Terralink+ vs. Standard Terralink Already run the standard Terralink? Here's how the Plus compares: 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) Permittivity Not measured 1–85, ±4% FS Waveguide Standard push-in probe 3-element, 316 stainless steel 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. MOST POPULAR 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 Add All to Cart — £1,376.95 View bundle details BEST PLACE TO START 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 Add All to Cart — £1,056.00 View bundle details 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+ plugs into canopyLINK or the HUB via its M8 connector, feeding root-zone data straight into Growlink OS for monitoring and automated crop steering. 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 Substrate Sensor — VWC, EC & temperature 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. Explore Growlink OS & Nova → New to Growlink OS? The Root plan is free forever for hobby growers — no credit card required — and includes 1 user, 4 sensors, 3-minute data resolution, and 90-day data storage. See all Growlink pricing plans → Free Growlink calculators: Dial in your setup before you buy — try the free Irrigation Schedule Calculator and the free Light & CO&sub2; Calculator. Need a hand? Check the Growlink Knowledge Base for setup guides and troubleshooting, or raise a support ticket directly with Growlink. Want the full methodology behind zone-based irrigation scheduling? Download Growlink's Precision Irrigation Playbook V21 (PDF).