Grow Sensor PRO is a canopy-level monitoring system designed for serious indoor growers. It measures light, climate and plant response directly where the plant lives — including PAR, spectrum, CO2 and leaf temperature — giving you accurate data to optimise your environment, improve consistency, and produce higher-quality harvests cycle after cycle.
Unlike typical grow room tools that measure isolated variables or rely on inferred values, Grow Sensor PRO captures everything together, at the same time, at the canopy level. The result is a complete, real-time picture of what your plants are actually experiencing.
Key Features
Direct canopy-level measurement — Grow Sensor PRO captures light, climate and plant response simultaneously at the canopy, not from a wall sensor or a separate meter. This eliminates guesswork and gives you data that reflects actual growing conditions.
True leaf VPD via infrared leaf temperature — By measuring leaf surface temperature with an infrared sensor, the device delivers true leaf VPD rather than estimates based on air temperature alone. It also provides the leaf-to-ambient temperature differential, a key indicator of plant stress and transpiration efficiency.
Pro-grade light data (validated PPFD accuracy) — The integrated quantum PAR sensor measures extended-spectrum light metrics including ePPFD, ePAR and eDLI. PPFD accuracy has been validated against Apogee reference sensors, giving growers confidence in their light measurements.
Free Grow app with alerts and unlimited history — The Grow Sensor app (iOS & Android) provides fast graphs, reliable alerts and unlimited historical data with no subscription required at present. Premium features may be introduced in the future.
Built for real grow rooms — Long battery life (typically 2 weeks to 3 months depending on settings), 2.4 GHz Wi-Fi connectivity, optional USB power, and offline data logging ensure the sensor works reliably in demanding environments.
Open ecosystem: Home Assistant + API access — Home Assistant integration is fully supported, and Grow Sensor PRO provides API access for advanced automation workflows.
What It Measures
Climate & Environment
- Air temperature
- Relative humidity
- CO2
- Dew point
- Atmospheric pressure
- Ambient VPD
Light & Photosynthesis
- ePPFD (extended spectrum)
- ePAR (extended spectrum)
- eDLI (extended daily light integral)
Plant Response
- Leaf surface temperature (infrared)
- True leaf VPD
- Leaf-to-ambient temperature differential
Substrate & Root Zone (via compatible probe)
Measured via Grow SubSense (sold separately):
- Substrate EC
- Water content
- Substrate temperature
Also compatible with a limited selection of specific SDI-12 probes (see Substrate Probe Compatibility below).
Technical Specifications
| Specification | Value |
|---|---|
| Connectivity | 2.4 GHz Wi-Fi |
| Power | Battery (typ. 2 weeks – 3 months); USB power option |
| Data Continuity | Offline data logging if the internet is unavailable |
| Light Metrics | ePPFD, ePAR, eDLI; PPFD accuracy validated vs Apogee |
| Climate Metrics | Air temp, RH, CO2, dew point, pressure, ambient VPD |
| Plant Response | IR leaf surface temp; true leaf VPD; leaf-to-ambient differential |
| Substrate Integration | SDI-12 compatible; supports one probe at a time (multi-probe coming soon) |
| App | iOS & Android; unlimited history + alerts; no subscription currently |
| Integrations | Home Assistant: Yes; API access |
| Warranty / Returns | 2-year warranty; 60-day satisfaction guarantee |
Use Cases & Applications
Grow Sensor PRO is designed for growers who need precise, canopy-level environmental data to drive better decisions:
- Indoor cannabis cultivation — Optimise VPD, light intensity and CO2 levels throughout vegetative and flowering stages for maximum yield and quality.
- Indoor crops in controlled environments (CEA) — Monitor and fine-tune climate, light and plant response for consistent results across crop cycles.
- Greenhouses and high-value horticulture — Where canopy-level measurement matters, the Grow Sensor PRO provides actionable data that room-level sensors cannot.
Strengths & Weaknesses
| Strengths | Weaknesses / Considerations |
|---|---|
| Direct canopy-level measurement across light, climate, and plant response (no inferred values or room-level averaging) | Root zone metrics require a compatible substrate probe (e.g., SubSense, sold separately) |
| True leaf VPD using infrared leaf temperature (not estimated) | SDI-12 compatibility is limited to specific probe models (listed below) |
| Free app with alerts and unlimited history; no subscription required at present | |
| Home Assistant integration + API access for open ecosystem workflows | |
| Built for deployment: Wi-Fi, offline logging, USB power option, long battery life |
Benefits for Farmers
The Grow Sensor PRO enables growers to make data-driven decisions based on what plants are actually experiencing at the canopy, rather than relying on room-level averages or manual spot checks. By providing real-time VPD, light and climate data alongside alerts, it helps prevent issues before they impact yield, reduces the need for manual monitoring, and improves consistency across grow cycles. The open ecosystem approach (Home Assistant + API) means the sensor fits into existing workflows rather than requiring growers to adopt a proprietary platform.
Integration & Compatibility
Grow Sensor PRO connects via 2.4 GHz Wi-Fi and is managed through the free Grow app (iOS & Android). Home Assistant integration is fully supported, and API access is available for custom automation workflows. The device supports offline data logging, ensuring data continuity even if the internet connection drops. Substrate monitoring is available via SDI-12 compatible probes.
Substrate Probe Compatibility (SDI-12)
The following probe models are supported:
- Delta-T WET-150
- Acclima TDR-310W
- Acclima TDR-315N
- METER Group TEROS 11
- METER Group TEROS 12
- Growlink Terralink
The sensor supports one probe at a time. Multi-probe support has been noted as coming soon.
What's in the Box
- Grow Sensor PRO
- 5 m USB power cable
- Reflective high-strength hanging cord with carabiner
- Access to the Grow Sensor app with unlimited historical data (iOS & Android)
- Priority onboarding support
Frequently Asked Questions
| Question | Answer |
|---|---|
| How does the Grow Sensor PRO work? | It uses integrated sensors at canopy level to simultaneously capture light (ePPFD, ePAR, eDLI), climate (temperature, humidity, CO2, dew point, pressure) and plant response (infrared leaf temperature, true leaf VPD). Data is transmitted via Wi-Fi to the free Grow app. |
| What setup is required? | Hang the sensor at canopy level using the included hanging cord and carabiner. Connect to your 2.4 GHz Wi-Fi via the Grow app. Optionally connect USB power. |
| Does it require a subscription? | No subscription is required at present. The app provides unlimited data and alerts for free. Premium features may come later. |
| What systems does it integrate with? | Home Assistant (fully supported) and API access for custom automation. Connects via 2.4 GHz Wi-Fi. |
| Can it measure substrate / root zone data? | Yes, via a compatible probe (Grow SubSense or supported SDI-12 probes). Probes are sold separately. |
| What warranty applies? | 2-year warranty and 60-day satisfaction guarantee. |
Pricing & Availability
The Grow Sensor PRO is listed at £599.00, backed by a 2-year warranty and 60-day satisfaction guarantee. Pricing can be affected by configuration and region. For detailed pricing and availability information, contact us via the inquiry button on this page.
