SubSense Substrate Sensor
SubSense Substrate Sensor
★★★★☆ 4.6 on Trustpilot (26 reviews)
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Estimated delivery: Mar 05 - Mar 09
Built for crop steering. Designed for Grow Sensor Pro.
Get precise root zone insights with this advanced substrate sensor, fully compatible with the Grow Sensor Pro. Whether you’re managing drybacks or fine-tuning EC levels, this sensor is engineered to support crop steering strategies with accurate, real-time data from where it matters most—the root zone.
This high-performance sensor measures:
- Pore Water EC (pwEC) – Track nutrient strength directly in the root zone.
- Substrate Moisture – Avoid over- or under-watering with reliable volumetric water content.
- Substrate Temperature – Monitor thermal conditions critical to root health and growth.
Tech specs:
- Output: SDI-12 (V1.3) – Fully compatible with Grow Sensor Pro
- Moisture Range: 0–100% VWC (±1.8% in 0–50% range)
- EC Range: 0–20 dS/m (±5%, 7% or 10% accuracy)
- Temp Range: –40°C to 85°C (±0.5°C)
- Cable: 3-meter waterproof cable
- Power Supply: 3.6–16V DC
- Current Draw: 30 µA (quiescent)
Highlights:
- Built for crop steering – Gives you the control to manage drybacks, EC stacking, and irrigation with precision
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Highly accurate VWC and pwEC readings via true dielectric permittivity
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Works in soil, coco, rockwool, hydroponic media, and mineral substrate
- Designed for buried or container setups – rugged and waterproof
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Includes reverse polarity and surge protection (TVS/ESD)
- Supports long-term deployment in greenhouses, indoor farms, and field environments
Wiring Reference:
Connect with ease using the colour-coded leads:
- RED (Signal) → SDI-12 data line
- WHITE (V⁺) → Power Supply +
- BARED (G) → Ground / Power Supply –
This sensor is plug-and-play with the Grow Sensor Pro and integrates easily with other SDI-12 compatible systems. Whether you’re a commercial grower, researcher, or advanced hobbyist, this tool gives you reliable, actionable insights to grow smarter.
Waterproof, durable, and ready to deliver data from the root zone - cycle after cycle.
For the installation guide click here.
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Import fees covered up to £100
Import fees covered up to £100
Ordering from abroad? We’ll cover up to £100 / $125 / €115 in import fees.
If you’re charged, just send us the receipt and we’ll refund you.
We currently ship to UK, all of the EU, US, Canada, Australia and New Zealand.
Any questions on click chat below.
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Trusted by growers worldwide
Nate Lipton
"The user-friendly tool that helps professional growers sleep well at night."
Tad Hussy
“It tracks the metrics that actually matter and brings real clarity to my grow environment.”
Chad Westport (USA)
“Easy to set up, easy to use, and the insights make it easy to dial in your environment.”
True Canna Cast Podcast
“It’s like having a second set of eyes on my garden at all times.”
Ian collins (UK)
“I usually ditch tech when it gets frustrating, this was up and running in minutes.”
Ben (NZ)
“No BS, this is the only sensor I need.”
Nichilas Ezzo (US)
“I’ve never second guessed the readings.”
Christoph Herzog (Germany)
“The measurements are consistently accurate.”
Ryan (USA)
“Intuitive design, built with the grower in mind.”
Grow Sensor FAQs
Do you link up to Home Assistant?
Do you link up to Home Assistant?
Almost! This is a feature we are currently working on. You will be able to use the Grow Sensor with Home Assistant very soon. We’re advocates of an open ecosystem for product and software compatibility.
Can I pay with cypto currency?
Can I pay with cypto currency?
Yup you sure can! Just select this payment option at checkout.
Does the Grow Sensor detect light leaks?
Does the Grow Sensor detect light leaks?
Yes! The Grow Sensor has a light sensor that tracks light leaks 24/7. You can set alerts to stay informed via The Grow App.
Does the Grow Sensor detect light failure during the daytime?
Does the Grow Sensor detect light failure during the daytime?
Absolutely! If your lights turn off during the day, you’ll be the first to know.
Do I need a computer to use the Grow Sensor?
Do I need a computer to use the Grow Sensor?
No, you can access The Grow App on your Android or iOS device. A browser version of the app for desktops is also in development.
Can I monitor my grow remotely?
Can I monitor my grow remotely?
Yes! With The Grow App, you can monitor your grow from anywhere in the world, as long as your sensor is connected to Wi-Fi.
Does the Grow Sensor log data without an internet connection?
Does the Grow Sensor log data without an internet connection?
It sure does! If your internet goes down, all your data will continue to log in the background, ensuring no gaps in your records.
How secure is my data?
How secure is my data?
Your data is encrypted and securely stored. We never share or sell your information, and you have full control over your grow data.
Will I be able to control devices with the Grow Sensor?
Will I be able to control devices with the Grow Sensor?
Yes, but not yet! Soon, you’ll be able to use the Grow Sensor with Home Assistant and MODBUS to control devices. In the long term, we plan to produce our own controller.
Does the Grow Sensor require a hub to work?
Does the Grow Sensor require a hub to work?
Nope! As long as you’ve got Wi-Fi, you’re good to go. The sensor also works in Bluetooth mode as a data logger when you’re away from a Wi-Fi connection.
How easy is it to set up the Grow Sensor?
How easy is it to set up the Grow Sensor?
The Grow Sensor is plug-and-play. Simply connect it to your Wi-Fi or use Bluetooth, and you’ll be up and running in minutes.
How long is the cable for direct power?
How long is the cable for direct power?
5 meters. If you need a longer cable, let us know.
How far does the Wi-Fi reach?
How far does the Wi-Fi reach?
Many variables contribute to this, such as wall thickness and router placement. The range is roughly 200 meters, depending on your setup.
Can you set limits and alerts for all sensor data?
Can you set limits and alerts for all sensor data?
Yes! You can set limits and alerts for everything the Grow Sensor measures. High and low thresholds, as well as dangerously high or low limits, are available. All alerts are sent as push notifications to your device.
How accurate are the measurements?
How accurate are the measurements?
Each Grow Sensor undergoes rigorous calibration and testing to ensure it delivers industry-leading accuracy across all metrics.
How long does the battery last?
How long does the battery last?
Between 2 weeks and 3 months, depending on your chosen settings. A feature allowing you to turn off sensors and reduce the frequency of readings to extend battery life is in development.
Can I link multiple sensors in the same room?
Can I link multiple sensors in the same room?
Not yet, but this is on our feature list. You’ll soon be able to group multiple sensors in one Grow to gain deeper insights from your data.
What happens if my Grow Sensor stops working?
What happens if my Grow Sensor stops working?
Our Grow Sensor is covered by an 18-month warranty for manufacturing defects and hardware failures. Our support team is also available to assist with any issues.
Where do you ship to?
Where do you ship to?
Currently we ship to the UK, EU, US and Canada. If you want a Grow Sensor and live outside of these areas, please contact us. We'll be adding more countries soon.
Is the Grow Sensor calibrated before shipping?
Is the Grow Sensor calibrated before shipping?
Yes! Every Grow Sensor undergoes extensive calibration to ensure you can trust your device.
Are there any subscription fees?
Are there any subscription fees?
The Grow App is free to use with your Grow Sensor. Premium features, such as AI insights, may require a subscription in the future.
Do you offer customer support?
Do you offer customer support?
Yes! Our friendly support team is available via email, chat, or phone for any quesitons you have. You’ll also find helpful guides and troubleshooting resources on our website.
Do you have a product Warranty?
Do you have a product Warranty?
Yea we do! Its a bit dry to read though:
This Limited Warranty applies to physical goods, and only for physical goods, purchased from Grow Sensors LTD (the "Physical Goods").
What does this limited warranty cover?
This Limited Warranty covers any defects in material or workmanship under normal use during the Warranty Period.
During the Warranty Period, Grow Sensors LTD will repair or replace, at no charge, products or parts of a product that proves defective because of improper material or workmanship, under normal use and maintenance.
What will we do to correct problems?
Gros Sensors LTD will either repair the Product at no charge, using new or refurbished replacement parts or replace the product.
How long does the coverage last?
The Warranty Period for Physical Goods purchased from Grow Sensors LTD is 365 days from the date of purchase.
A replacement Physical Good or part assumes the remaining warranty of the original Physical Good or 365 days from the date of replacement or repair, whichever is longer.
What does this limited warranty not cover?
This Limited Warranty does not cover any problem that is caused by:
● conditions, malfunctions or damage not resulting from defects in material or workmanship
What do you have to do?
To obtain warranty service, you must first contact us to determine the problem and the most appropriate solution for you.
Do you have a satisfaction Guarantee?
Do you have a satisfaction Guarantee?
Yup, read that here.
We are confident in the quality of our products and firmly believe that you will be delighted with your purchase.
However, we understand that sometimes things may not go as planned.
That's why we offer our 30-day money-back guarantee, so there's no need to worry.
Simply send us an email at hi@growsensor.co, and we'll take care of everything for you.
We'll promptly process a refund for the full purchase price, which will be promptly credited back to your original payment method.
Your satisfaction is our utmost priority, and we'll ensure that you're a happy customer!
