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A blue TrolMaster substrate sensor with a digital display showing readings for moisture, EC, and temperature.
A blue digital sensor with a screen displays readings, attached to probes and black cables.
TrolMaster WCS-9 substrate sensor set with blue sensor box and coiled black cables on a dark blue surface.
Blue TrolMaster WCS-9 Substrate Sensor with digital readout and coiled cable on a dark reflective surface.
Blue TrolMaster sensor displays 55% humidity, 2.06 mS/cm conductivity, and 88.5°F temperature.
Blue TrolMaster WCS-9 substrate sensor with probes, cables, and display screen showing readings.
Close-up of a blue soil moisture meter with two silver probes inserted into dark, damp soil.
TrolMaster WCS-9 substrate sensor attached to a grow cube with a young plant.
A blue TrolMaster substrate sensor with a digital display showing readings for moisture, EC, and temperature.
A blue digital sensor with a screen displays readings, attached to probes and black cables.
TrolMaster WCS-9 substrate sensor set with blue sensor box and coiled black cables on a dark blue surface.
Blue TrolMaster WCS-9 Substrate Sensor with digital readout and coiled cable on a dark reflective surface.
Blue TrolMaster sensor displays 55% humidity, 2.06 mS/cm conductivity, and 88.5°F temperature.
Blue TrolMaster WCS-9 substrate sensor with probes, cables, and display screen showing readings.
Close-up of a blue soil moisture meter with two silver probes inserted into dark, damp soil.
TrolMaster WCS-9 substrate sensor attached to a grow cube with a young plant.

TrolMaster WCS-9 3-in-1 Substrate Sensor Set (VWC, EC, Temp)

Official TrolMaster Dealer Model: WCS-9
$199.00 USD$189.05 USD$199.00 USD
 $199.00 USD
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  • Aggregates data from up to 4 daisy-chained nodes for precise root zone averages
  • Multi-point sensing eliminates data distortion from water channeling and hot spots
  • Directly compatible with Aqua-X, Hydro-X Pro, and Tent-X control ecosystems
  • 3-year warranty on all mechanical and electronic components
  • View More Details
Order today, ships between June 18 - July 2, 2026

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Commercial & Bulk Purchasing

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

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THROUGH THE Cultivator's LENS Hands-On Evaluation

Who This Is For

  • You are moving to multi-node sensing because single-point sensors give you skewed data from local water channeling.
  • You are adopting feed on demand control because rigid timers cannot account for how fast your crop drinks every day.

What We Found

  • The daisy-chain setup is much cleaner for large tables than running individual home runs for every sensor
  • Calibration is surprisingly fast, which is a relief when you are setting up four nodes across a massive canopy
  • The multi-node average is the only way to get a real moisture picture if you use high-porosity soilless substrates

What Users Say

  • Operators using the multi-node setup say they finally stopped chasing ghost dry spots that single sensors reported
  • Commercial users tell us the Feed on Demand feature paid for the system by cutting down on monthly nutrient waste

TrolMaster WCS-9 Substrate Sensor Set | Multi-Point Root Zone Monitoring

The WCS-9 Substrate Sensor Set provides commercial growers with high-precision measurements of volumetric water content, electrical conductivity, and temperature within the root zone. This system integrates directly with TrolMaster control platforms to automate irrigation based on real-time substrate data. It is an essential component for any professional digital meters setup requiring Feed on Demand control.

TrolMaster WCS-9 Substrate Sensor Set (VWC, EC & Temp) in use
0–100%Water Content Range
0–30mS/cmEC Range
32–122°FMeasurement Range

Features

Precision Measurement

High-accuracy probes capture VWC, EC, and temperature simultaneously to provide a comprehensive view of root zone health.

Data Aggregation

The system averages readings from multiple sensors to eliminate data skew caused by localized anomalies or water channeling.

Daisy-Chain Connectivity

Advanced wiring allows for multiple sensor nodes to be linked in series, simplifying cable management in large-scale facilities.

Feed on Demand Control

Link sensor data to irrigation schedules to trigger feeding cycles precisely when the substrate reaches a specific VWC threshold.

In Detail

TrolMaster WCS-9 Substrate Sensor Set application view

The WCS-9 utilizes dynamic reading intervals to maintain current data without over-polling the medium. By distributing monitoring across multiple points, you can identify dry pockets or saturated zones that a single sensor would miss. This multi-point approach is critical for intermediate and commercial growers managing high-bulk EC soilless substrates where uniformity is difficult to maintain manually.

  • Aggregates VWC, EC, and Temperature for accurate averages
  • Supports Feed on Demand irrigation triggers via Aqua-X systems
  • Simplifies sensor calibration through the TrolMaster app interface
  • Scalable design allows for monitoring across various points in the medium
  • Daisy-chain connectivity reduces overall cable clutter in the grow room

Compare the Substrate Sensor Line

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

Technical Specifications

ELECTRICAL
Input Voltage12V 0.1A
Max Input Current0.1A
MEASUREMENT RANGE
Water Content Range0~100%
EC Range0~30 mS/cm
Measurement Range32~122°F (0~50°C)
ENVIRONMENT
Operating Temperature32~122°F (0~50°C)
Operating Humidity≤90%RH

In the Box

  • 1 x WCS-9 Sensor Display
  • 1 x WN-9 Sensor Node
  • 1 x 16ft RJ12 Cable Set
  • 1 x T-Splitter

Warranty

This substrate sensor set is covered by the standard manufacturer warranty against defects in materials and workmanship. The warranty period ensures reliable operation within specified environmental limits for commercial and hobbyist use. 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

How does the WCS-9 handle localized dry spots in the substrate?

The system uses data aggregation to average readings from multiple sensor points. This prevents a single dry pocket or water channel from triggering an premature or unnecessary irrigation cycle.

Is this sensor compatible with the original Aqua-X controller?

Yes, the WCS-9 is compatible with both Aqua-X and Hydro-X control systems. It connects via the standard RJ12 cable set included in the box.

How many WCS-9 sets can be daisy-chained together?

The number of units depends on the specific TrolMaster controller being used. The daisy-chain architecture allows for scalable monitoring across large growing areas without individual cable runs to the main controller.

Does the sensor require manual calibration for different substrates?

The WCS-9 features a simplified calibration process accessible through the TrolMaster app. This allows you to calibrate for specific media types to ensure VWC and EC accuracy across different growing cycles.

Can I use the WCS-9 for Feed on Demand irrigation?

Yes, the VWC data can be used as a trigger for irrigation events. When the average water content drops below your set threshold, the controller can activate your pumps automatically.

What is the maximum operating humidity for the sensor display?

The sensor display and node are rated for operating environments with humidity levels up to 90% relative humidity. It is designed to withstand the high-moisture conditions typical of indoor grow rooms.

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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.)

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