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Black soil moisture sensor with three metal probes, a digital display showing "0", and a coiled black cable.
A black TrolMaster water content sensor with three silver prongs and a green display is shown on a white background.
TrolMaster WCS-3 sensor with black housing and three white prongs, and a silver probe.
Black substrate water content sensor with three silver probes and a digital display.
Black soil moisture sensor with three metal probes, a digital display showing
A black TrolMaster water content sensor with three silver prongs and a green display is shown on a white background.
TrolMaster WCS-3 sensor with black housing and three white prongs, and a silver probe.
Black substrate water content sensor with three silver probes and a digital display.

TrolMaster WCS-3 Substrate Water Content Sensor

Official TrolMaster Dealer Model: WCS-3
$124.95 USD$118.70 USD$124.95 USD
 $124.95 USD
starting from 0% interest financing from /mo.

Payment Options

Options:Pay in Four, Pay Monthly
Amount:Up to $1,500 (Pay in 4)
Up to $10,000 (Monthly)
Schedule:Bi-weekly to Monthly
Term:6 weeks, 12 or 24 months
Interest:0% to 35.99% APR*
Credit Check?Soft Check Only
Schedule:Bi-weekly to Monthly
Term:6 weeks, 6 or 12 months
Interest:0% to 35.99% APR*
Credit Check?Soft Check Only
Finance up to:$4,000
Must apply on a desktop device.
Schedule:Flexible
Term:Up to 36 months
Interest:Processing fee + interest
Lease-to-Own?Yes
Amount:$500 to $10,000
Looking to finance equipment under your corporation? Learn more about Business Financing
  • Monitor up to 50 separate zones on a single NFS-2 or HCS-2 controller
  • 3-prong volumetric water content sensor with an ultra-slim root zone profile
  • Compatible with TrolMaster Aqua-X, Hydro-X Pro, and Tent-X systems
  • 3-year warranty on all mechanical and electronic components
  • View More Details

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VOLUME PRICING

Commercial & Bulk Purchasing

We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.

Commercial Inquiry

Contact Information
THROUGH THE Cultivator's LENS Hands-On Evaluation

Who This Is For

  • You are transitioning to crop steering because guessing when to water by hand is causing inconsistent harvest cycles.
  • You are adding VWC sensors because a simple timer can't account for how fast your medium dries out as the crop grows.

What We Found

  • The ultra-slim prongs slide into rockwool without splitting the block, which helps keep the root zone stable.
  • That tap-to-wake screen is the best way to get a fast reading without needing to pull your phone out mid-task.

What Users Say

  • Users who switched to VWC monitoring say they finally dialed in their dry-backs with total precision and confidence.
  • Commercial operators say daisy-chaining these sensors across fifty zones cut their manual testing time to zero.

TrolMaster WCS-3 Water Content Sensor 3 | Precision Substrate Monitoring for Crop Steering

The TrolMaster WCS-3 provides real-time volumetric water content data for professional growers using digital meters to optimize irrigation cycles. This sensor enables precise crop steering; a technique where moisture levels are manipulated to influence plant development and secondary metabolite production. It integrates directly with the Hydro-X system to provide immediate feedback on media saturation and dry-back rates.

TrolMaster WCS-3 Water Content Sensor 3 with Splitter Cable Set in use
12VInput voltage
122℉Max operating temp
90%RHMax humidity

Features

Tap-to-Wake LCD Display

The integrated screen allows for immediate on-site verification of moisture levels without checking the central controller or mobile app.

Crop-Steering Compatible

The sensor tracks volumetric water content to help growers manage generative and vegetative growth phases through precise irrigation control.

Daisy-Chain Expandability

Multiple sensors connect in a series using the included M12 T-splitter to monitor various zones across a single controller port.

Mobile Alarm Notifications

The system pushes alerts to your mobile device if moisture setpoints are exceeded or fall below your defined irrigation parameters.

In Detail

TrolMaster WCS-3 application view

The WCS-3 utilizes an ultra-slim design to minimize displacement in small rock wool cubes or coco coir pots. It measures moisture levels continuously, providing the granular data required to calculate dry-back percentages accurately. By monitoring the volumetric water content (VWC) in real-time, you can automate your irrigation pumps to fire only when the substrate reaches a specific depletion point.

  • Real-time volumetric water content measurement
  • M12 T-splitter included for simplified wiring
  • Low 100-200 mA current draw for efficient operation
  • Compatible with soil, coco, and rock wool media
  • Rugged construction for high-humidity environments

Compare Sensors

Measurement Parameters
Connectivity
Compatibility
Best For
WCS-1 WCS-1
VWC Only
Standard RJ12
Aqua-X, Green-X, Tent-X
Hobbyists needing basic moisture tracking in soil or soilless media.
WCS-2 WCS-2
VWC, EC, Temperature
Standard RJ12
Aqua-X, Green-X, Tent-X
Growers requiring single-point monitoring of all three root zone metrics.
WCS-3 WCS-3 You're viewing
VWC Only
M12 Daisy-Chain
Aqua-X Pro, Hydro-X Pro
Advanced moisture monitoring with high-capacity daisy-chain scalability.
WCS-9 WCS-9
VWC, EC, Temperature
RJ12 Daisy-Chain
Aqua-X, Hydro-X
Commercial facilities requiring multi-point data averaging and full metric tracking.

Technical Specifications

Input Voltage12V = 0.1A
Input Current100-200 mA
Operating Temperature32~122℉
Humidity<90%RH

In the Box

  • 1x Water Content Sensor3
  • 1x M12 T-splitter
  • 1x 4ft M12 Cable

Warranty

This sensor is covered against manufacturing defects and hardware failures under normal operating conditions. Trimleaf is an authorized TrolMaster retailer; this unit ships with the full manufacturer warranty, valid for the original purchaser.

Owner's Manual

Product Manual

Frequently Asked Questions

Does this sensor work with all types of grow media?

The WCS-3 is calibrated for use with rock wool, coco coir, and soil substrates. It provides accurate volumetric water content readings across these common hydroponic and organic media types.

How many sensors can I connect to a single controller?

You can daisy-chain multiple sensors using the included M12 T-splitters. The total number of sensors is limited by the available ports and addressing capacity of your Hydro-X controller.

Will I receive alerts if the moisture level drops too low?

Yes, the system allows you to set high and low setpoints for moisture levels. If the substrate dries out beyond your target, the controller will trigger a mobile notification to alert you immediately.

Is the display always on?

The LCD features a tap-to-wake function to conserve energy and reduce light pollution in the grow room. You simply tap the unit to view the current moisture percentage.

Can I extend the distance between the sensor and the controller?

The unit includes a 4ft M12 cable for standard setups. For larger rooms, you can use additional M12 extension cables to reach distant zones while maintaining signal integrity.

Happy To Help

Questions About This Product?

Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)

Call (360) 800-5535

Why Trimleaf

Equipping home growers, craft producers, and commercial operations across North America since 2016.

10+
Years of Specialist Knowledge
4.8★
Over 1,900 Verified Reviews
50,000+
Growers Served
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