🌿 SONOFF MS01 — Soil Moisture Sensor (RJ9, for TH Series)
Automate irrigation based on real soil moisture data. The SONOFF MS01 is a weatherproof soil moisture sensor that plugs into the RJ9 port on any SONOFF TH controller. When soil moisture drops below your threshold, the TH switch turns on your irrigation pump or solenoid automatically. No more over-watering or under-watering. Extend up to 10m with the optional RL560 extension cable. MPN: MS01.
Choose your TH sensor (RJ9 connector):
⚡ Key Features
- Real-Time Soil Moisture Detection — measures soil moisture percentage and feeds data to your TH controller for automated irrigation
- Weatherproof Build — designed for outdoor use; withstands rain, sun, and soil conditions
- Automated Irrigation — “If soil moisture < 30% → turn on irrigation pump.” Water only when your garden actually needs it
- RJ9 Plug-and-Play — plug into any SONOFF TH controller’s RJ9 port; recognised instantly
- Extendable to 10m — use the optional RL560 RJ9 extension cable to place the sensor further from the controller
- 6-Month Moisture History — track soil moisture trends in the eWeLink app over 6 months via the connected TH controller
- Saves Water & Electricity — stops watering when the soil is already moist; reduces pump run time and water waste
🏠 Use Cases
Garden Irrigation
Insert the probe into your garden bed. When moisture drops below your setpoint, the TH controller switches on the irrigation pump or solenoid. No more guessing when to water.
Vegetable Patches
Keep your veggie garden consistently watered. Set moisture thresholds per season and let the system handle the rest. Healthier plants, less effort.
Potted Plants & Greenhouse
Monitor soil moisture in large pots or greenhouse beds. Automate drip irrigation systems based on actual soil conditions rather than timers.
Small-Scale Farming
Automate irrigation for tunnels, raised beds, or smallholdings. The 6-month data history helps you understand soil moisture patterns across seasons.
🔗 Compatible TH Controllers (Required)
The MS01 requires a SONOFF TH controller. The sensor plugs into the RJ9 port on the TH unit.
SONOFF TH Elite 20
20A smart switch with LCD display, 6-month history, and RJ9 sensor port.
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SONOFF THR320 Origin
20A smart switch with RJ9 sensor port. Budget 20A option.
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SONOFF THR316 Origin
16A smart switch with RJ9 sensor port. Most affordable TH controller.
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📋 Technical Specifications
| Product | SONOFF MS01 Soil Moisture Sensor |
| MPN / Model | MS01 |
| Measurement | Soil moisture (percentage) |
| Build | Weatherproof (outdoor rated) |
| Connector | RJ9 (4P4C) |
| Extendable | Up to 10m with RL560 extension cable |
| Compatible With | THR320 · THR320D (Elite) · THR316 |
| Warranty | 1 Year Manufacturer Warranty |
❓ Frequently Asked Questions
How deep do I insert the probe?
Can I use multiple MS01 sensors on one TH controller?
What’s a good moisture threshold for irrigation?
Why can MS01 only extend to 10m vs 60m for THS01?
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Water Smarter. Not Harder.
Soil moisture sensor for automated irrigation. RJ9 plug-and-play.
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