Sonoff · WTS01

Sonoff WTS01 waterproof temperature sensor RJ9 for TH Elite/TH Origin

Name: Sonoff WTS01 waterproof temperature sensor RJ9 for TH Elite/TH Origin
Brand: Sonoff
SKU: SONOFF-WTS01
Price: 179 MDL
Availability: InStock

179 MDLIn stock

External temperature probes

Manufacturer images

179 MDLIn stock

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Measured parameters: Temperature
Temperature measuring range: −40…115 °C
Cable length: 1.5 m

Built to sit in the liquid itself, the stainless WTS01 probe works from −40 to +115 °C, with ±0.5 °C accuracy over −10…+85 °C, on a 1.5 m RJ9 lead — and only a TH Elite or TH Origin relay can read it.

18 specifications from manufacturer documents

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The right choice starts with specifications

Device passport

SKU: SONOFF-WTS01 · Document model: WTS01

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

Connectivity and compatibility5

Host device required — what it means An external probe does not send data on its own: it plugs into a compatible device (relay, thermostat, sensor), which then shows the temperature in the app. A standalone sensor has its own radio and power.	Yes — plugs into another deviceWorks only when plugged into a TH Elite or TH Origin relay [1]
Compatible devices — what it means The devices the manufacturer lists as compatible with the probe. Other models, even from the same brand, are not guaranteed to work.	SONOFF TH Elite (THR316D / THR320D), SONOFF TH Origin (THR316 / THR320) [1]
Connector — what it means Which connector the probe uses to plug into the host device; it must match the socket on that device. On standalone sensors the probe is usually fixed.	RJ9 (4P4C) [1]
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 probe)No radio of its own: the TH Elite / TH Origin relay sends the data over Wi-Fi [1]
App — what it means The maker’s app used to set up and control the device.	eWeLink (via the TH Elite / TH Origin relay) [2]

Measurement and detection4

Measured parameters — what it means Which values the monitor measures with its own sensors. Data the app pulls from the internet (such as outdoor air quality) is not included.	Temperature [1]
Temperature measuring range — what it means The range over which the probe measures temperature. The upper limit matters for hot water, heating circuits or a sauna; the lower limit for a freezer or outdoors.	−40…115 °CThe stated accuracy applies over −10…+85 °C; the 2026 brochure lists −10…+85 °C as the measuring range and −40…+115 °C as working temperature [1]
Temperature accuracy — what it means Permitted error of the built-in sensor, ± °C. A value of 1 means that at 21 °C in the room the thermostat may show anything from 20 to 22 °C.	0.5 °C±0.5 °C over −10…+85 °C (official infographic and spec table on the product page) [1]
Sensing element — what it means The model or type of sensor inside the probe (a digital sensor, an NTC thermistor, etc.) if the manufacturer names it. Useful when connecting to third-party controllers.	DS18B20The TH Elite/TH Origin support pages list it as 'WTS01/DS18B20 (temperature sensor)' [2]

Housing and installation6

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.	1.5 mWith the SONOFF RL560 extension cable (5 m, RJ9 4P4C) — up to 60 m [1]
Waterproof probe — what it means Whether the sensing tip is protected against water according to the manufacturer, so it can go into water, a tank or a damp place. The host housing's protection is given separately as the IP rating.	YesThe steel probe is waterproof and corrosion-resistant; no IP rating is stated [1]
Probe tip material — what it means What the sensing part is made of. A metal sleeve conducts heat well and withstands moisture; a vented plastic housing is used for humidity sensors that need access to air.	Stainless steelPVC-sheathed cable (brochure) [1]
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.	Not stated by the manufacturer
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.	50 × 6 × 6 mm'Product size' in the spec — the steel probe sleeve (Ø 6 mm) [1]
Weight — what it means The device’s weight without packaging, per the maker.	36.3 g [3]

Control and features1

Display — what it means Whether the unit has its own screen with readings. With a screen you can see the temperature without a phone; without one, only in the app.	No displayNo screen of its own; readings appear on the TH Elite screen or in the app [1]

Power1

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 host device via cablePowered by the TH relay through the RJ9 cable; no battery [1]

Operating conditions1

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.	−40…115 °C [1]

Model and version1

Colour — what it means The housing colour of this model. Other colours in the same series are separate products.	Black [1]

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

A hand adjusts a wall thermostat in a living room with a radiator — An example routineEach room has its own temperature.

What to check before buying

This is a sensor: it reports measurements. Heating adjustment needs separate actuators and a control routine.
Power — From the host device via cable: plan it for the mounting spot.

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