Sonoff · MS01

Sonoff MS01 soil moisture sensor RJ9 for TH Elite / TH Origin relays

Name: Sonoff MS01 soil moisture sensor RJ9 for TH Elite / TH Origin relays
Brand: Sonoff
SKU: SONOFF-MS01
Price: 409 MDL
Availability: InStock

409 MDLIn stock

Soil moisture sensors

Manufacturer images

409 MDLIn stock

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Measurements: Soil moisture
Connectivity: None (wired to another device)
Moisture sensing method: Capacitive

On its own the MS01 does nothing — this RJ9 soil probe feeds a Sonoff TH Elite or TH Origin relay, which switches your pump or watering valve at the moisture threshold you set.

No separate hub required

No hub is needed, but a TH Origin or TH Elite relay is: it connects to the router over Wi-Fi and works in the eWeLink app.

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24 specifications from manufacturer documents

We deliver across Moldova. Availability, delivery timing and cost are confirmed with a manager before order fulfilment.

The right choice starts with specifications

Device passport

SKU: SONOFF-MS01 · Document model: MS01

Specifications checked against the linked manufacturer documents.Checked 18 October 2026

Measurement and detection4

Measurements — what it means Which values the sensor reports. Soil moisture drives automatic watering; temperature and light help judge growing conditions.	Soil moistureMeasures relative soil moisture only; it does not measure soil temperature or light [1]
Moisture sensing method — what it means A capacitive sensor measures moisture through an insulated body, so its electrodes do not touch the soil and do not corrode. A resistive sensor passes current through the soil, and its metal electrodes oxidise over time.	Capacitive [1]
Moisture measuring range — what it means Limits within which the sensor reports soil moisture. The percentages are relative: the dry / wet threshold for watering is tuned to your own soil.	0–100%The specification image on the maker's site says 0–99 % RH [1]
Moisture accuracy — what it means Permitted error as stated by the maker: ±5 % means a 40 % reading may really be anywhere from 35 to 45 %.	Not stated by the manufacturer

Connectivity and compatibility6

Connectivity — what it means The wireless link or network the device uses. Wi-Fi connects straight to the router; Zigbee, Thread and Bluetooth Mesh work through a hub or gateway.	None (wired to another device)No radio of its own: the probe plugs into a TH Origin / TH Elite relay by RJ9 cable, and the relay sends the data over 2.4 GHz Wi-Fi [2]
Works with — what it means For wired probes, the device the sensor cannot work without: the relay or controller it plugs into by cable. Wireless sensors do not need one.	Sonoff TH Origin (THR316 / THR320) or TH Elite (THR316D / THR320D) relayMS01 is listed as a supported sensor on the TH Origin and TH Elite pages. The probe does not work without one of these relays [1]
Connector — what it means Which plug connects the probe to the relay or controller. Connectors from different makers are usually not interchangeable.	RJ94P4C [2]
Hub required — what it means Whether the device needs a separate hub, gateway or coordinator to work in a smart home. If so, it is sold separately unless stated otherwise.	No hub neededNo hub is needed, but a TH Origin or TH Elite relay is: it connects to the router over Wi-Fi and works in the eWeLink app [3]
App — what it means The maker’s app used to set up and control the device.	eWeLink (via the TH Origin / TH Elite relay) [2]
Voice assistants — what it means Which voice assistants the module works with, per the maker. Commands like 'turn on the air conditioner' go through the cloud, so internet access is needed.	Google AssistantVoice query of soil moisture works via the TH Origin / TH Elite relay [2]

Housing and installation9

Probe length — what it means Length of the part pushed into the ground. It determines the depth at which moisture is measured — near the surface or closer to the roots.	Not stated by the manufacturer
Cable length — what it means Length of the cable from the adapter body to the plug. For a detachable cable, the length of the supplied cable is given.	0.5 m [1]
Maximum extended length — what it means How far from the relay or controller the probe can be placed using an extension cable, as stated by the maker.	10 mWith two 5 m Sonoff RL560 extension cables; the extension cable is not included [2]
Ingress protection (IP) — what it means Protection against dust (first digit) and water (second). IP20 is for dry rooms only, IP44 resists splashes, IP65 and up handle water jets and outdoor use.	IP55Applies to the MS01 probe itself: the maker says it can stay in the soil during watering and in the rain. No IP rating is stated for the TH Origin / TH Elite relay [1]
Dimensions — what it means The device’s size in millimetres as the maker states it. Check that it fits the wall box, niche or shelf.	130 × 30 × 13 mm [1]
Weight — what it means The device’s weight without packaging, per the maker.	28.9 g [4]
Housing material	Polycarbonate (PC) [2]
Compatible extension cable	Sonoff RL560 (5 m, RJ9 4P4C), up to two — up to 10 m [5]
Certifications — what it means Standards and certifications the maker lists for this model (for example CE, RoHS, Zigbee 3.0, Matter).	CEThe CE mark and EU declaration of conformity are printed in the manual [2]

Power2

Power source — what it means Where the device gets its power: 230 V mains, an adapter, USB, batteries or a built-in battery.	From the relay / controller (low voltage)Powered from the TH Origin / TH Elite relay output through the RJ9 cable [2]
Supply voltage — what it means The supply voltage (and current, if stated) as the maker gives it. It must match your mains or adapter.	3.3 V (from the TH Origin / TH Elite output) [2]

Operating conditions2

Operating temperature — what it means The air temperature range the device is rated for. The lower limit matters outdoors, on balconies and in unheated rooms.	0–60 °CFor the probe. The TH Origin / TH Elite relay is rated for −10…40 °C [1]
Housing flame-retardant rating	V0 [1]

Control and features1

Built-in display — what it means Whether the sensor has a screen showing readings right at the plant bed, without a phone.	NoThe probe has no screen: readings are viewed in the eWeLink app via the TH Origin / TH Elite relay [2]

Model and version1

Colour — what it means The housing colour of this model. Other colours in the same series are separate products.	GreyCatalogue colour: Dim Gray [4]

Package contents1

Package contents — what it means What comes in the box, per the maker.	MS01 sensor with 0.5 m cable and RJ9 plugThe RL560 extension cable and the TH Origin / TH Elite relay are sold separately [6]

Manufacturer documents

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Delivery and stock

We deliver across Moldova. Availability, delivery timing and cost are confirmed with a manager before order fulfilment.

How is payment handled?

A website order is submitted for confirmation without charging your card. The payment method and final amount are agreed with a manager before payment.

Warranty and documents

The warranty is at least 12 months. The exact period and conditions for equipment and installation work are stated in the sales documents and the accepted proposal. Further support is agreed for each project.

Can I return the product?

Current conditions are published on the Return policy page. Email office@casasmart.md with your order number for the steps relevant to your situation. Statutory consumer rights continue to apply.

Delivery, payment and returns

In your home

First detect it. Then trigger the right routine.

A sensor reports measurements or events. What happens next depends on configuration and separate control devices.

See the complete solution

Raised beds on a terrace and a garden tap with a smart watering valve — An example routineWatering follows the schedule and garden conditions.

What to check before buying

A garden valve is not automatically suitable as an apartment emergency shutoff. We check thread, pressure, outdoor conditions and model functions.
Power — From the relay / controller (low voltage): plan it for the mounting spot.

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