OWON THS-317-ET – Zigbee Temperature Sensor with 2.5-meter External Probe

Measure temperature where normal sensors cannot reach

A smart thermometer on the wall measures the air temperature, but how do you know if your underfloor heating supplies the water at the right temperature?
Is your pool warm enough? Is your freezer temperature off? Or is your expensive heat pump not working properly?
The OWON THS-317-ET is a Zigbee 3.0 temperature sensor with a 2.5-meter external probe that you place directly in liquids, pipes or rooms – while the Zigbee module remains safely outside the environment to be measured.

With a measuring range of -40°C to +200°C and an accuracy of ±0.5°C , the THS-317-ET (we sell the V2 version) is suitable for applications ranging from freezers to heating pipes. The sensor is powered by two AAA batteries and connects via Zigbee 3.0 – directly compatible with Home Assistant via ZHA and Zigbee2MQTT.

⚠️ Note: This is the standard Zigbee version, not the Tuya version. There is also a THS-317-ET-TY (Tuya) variant that works with Tuya hubs (LIDL, WOOX, NOUS), but not with Zigbee2MQTT or ZHA. The THS-317-ET you buy here is only suitable for standard Zigbee platforms such as Home Assistant .

✅ Key Features & Benefits

• 2.5 Meter Remote Probe – Measure remotely in pipes, liquids, and enclosed spaces while the Zigbee module remains outside
• Huge measuring range: -40°C to +200°C – From freezer to heating pipe, swimming pool and industrial applications
• ±0.5°C accuracy – V2 version (from January 2024) with improved precision
• Zigbee 3.0 – IEEE 802.15.4 @ 2.4 GHz; works with any Zigbee 3.0 network
• Plug and play – Directly supported in Zigbee2MQTT and ZHA for Home Assistant
• Battery powered – 2x AAA batteries; economical consumption for long life
• Battery Status Monitoring – Low battery notification in your home automation platform
• Temperature calibration – Offset and precision adjustable via Zigbee2MQTT
• Compact size – 62 × 62 × 15.5 mm; fits discreetly on a wall or in a cupboard
• 100 meter range – In open space; 30 meters indoors

🔌 Compatibility

🏠 Practical Example: Automatically Monitor Swimming Pool Temperature

1. Mount the OWON THS-317-ET next to the pool (not saltwater) and guide the probe into the water – seal the probe during prolonged immersion.
2. Home Assistant continuously receives the water temperature via Zigbee2MQTT.
3. Set an automation: receive a notification on your phone when the temperature falls below 22°C.
4. Connect a smart switch to the heat pump: automatically switch on when the temperature is too low, switch off at 26°C.
5. Check the pool temperature anywhere in the world via the Home Assistant app.

⚙️ Technical Specifications

⚠️ Points of attention

• Not the Tuya version – The THS-317-ET is not compatible with Tuya hubs (LIDL, WOOX, NOUS). For Tuya platforms, please choose the THS-317-ET-TY.
• Not suitable for salt water – The probe must not be used in swimming pools containing salt water or other salty liquids.
• Sealing for Submersion – For long term immersion in liquids, sealing the probe is strongly recommended
• Not compatible with Aqara hub – Does not work with the Aqara ecosystem
• Temperature only – no humidity – Choose the THS-317 for air temperature and humidity measurements
• Range depends on environment – ​​Walls and obstacles reduce the range from 100m to approximately 30m indoors

❓ Frequently Asked Questions (FAQ)

What is the difference between the THS-317-ET and the THS-317?

The THS-317-ET has a 2.5-meter external probe for measurements in liquids and pipes. The standard THS-317 measures air temperature and humidity via a built-in sensor, without an external probe.

What is the difference between the THS-317-ET and the THS-317-ET-TY?

The THS-317-ET-TY is the Tuya version for Tuya hubs. This product (THS-317-ET) is the standard Zigbee version for Home Assistant , Zigbee2MQTT, and ZHA. They are not interchangeable.

Can I use the probe in my pool?

Yes, but only in salt-free pools. Seal the probe for prolonged immersion. The probe should not be used in saltwater.

Can I calibrate the measured temperature?

Yes. Using Zigbee2MQTT, you set a temperature_calibration offset and adjust the temperature_precision to the desired number of decimal places.

How quickly does the sensor report new values?

The reporting interval is adjustable between 1 and 5 minutes.

How long do the batteries last?

OWON designed the THS-317-ET for ultra-low power consumption, ensuring long battery life. The sensor automatically reports low battery levels via Zigbee 2MQTT or ZHA.

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