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BRAND:  yolink        MODEL: YS8004     

Weatherproof Temperature Sensor w/Probe
Weatherproof Temperature Sensor w/Probe
Weatherproof Temperature Sensor w/Probe


Smart outdoor thermometer with probe, monitors, records, and reports to the YoLink app the current temperature. Please note: a YoLink Hub or SpeakerHub is required (see below).  




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2-Year Warranty

Easy Do-It-Yourself Installation

U.S. Phone Support Available

100% Satisfaction Goal




Home Assistant

Raedius Web Console


  • Smart outdoor thermometer and hygrometer monitors, records, and reports to the YoLink app the current temperature and humidity level


  • Exceptional value; accurate temperature sensor in one smart device at a great price
  • Works with the convenient and user-friendly YoLink app
  • Know the current temperature level at the sensor’s location. Check remotely using the YoLink app, anytime and from anywhere
  • Create customized alerts, to be informed of high- or low-temperature levels via emails or app push notifications
  • Create custom automation using the YoLink app, to trigger responses from other YoLink devices, such as the Siren Alarm
  • Use the IFTTT service ( to create custom automation with YoLink and third-party devices, tailored to your particular needs and your IoT devices (IFTTT is a paid service for more than 3 custom automation)
  • Compact design allows for placing the sensor where others may not fit
  • Easy to install and portable; move to other locations as needed
  • Lower cost of ownership than other technologies; low-power operation means batteries may last over 2 years, compared to 1 or less from other brands
  • Carefree maintenance, with more years between battery replacement
  • Low-battery alerts give you advanced warning that it is almost time to replace the batteries
  • Uses standard lithium batteries (2 AAA batteries)
  • Extremely easy and fast installation using the YoLink app with Scan & Play
  • Use the YoLink smartphone app to remotely monitor the temperature of your home, rental property, condo, summer home, or business (internet connection and YoLink Hub required)
  • YoLink’s industry-leading long-range communication allows for placing the sensor in your out-buildings, separate garage buildings, barns, greenhouse, etc.
  • Monitor any water temperature: pool, hot tub, aquarium, boilers, water trough, etc.
  • Monitor temperatures of surfaces when the sensor is affixed to the object, such as clamping the probe to a hot water pipe
  • There are numerous pet care applications:
  • For reptile tanks (turn on a heat lamp if the temperature gets too low, or turn off the lamp if it gets too hot)
  • Place one an outdoor dog house, to know if it’s too cold for them
  • Place in a barn, to ensure your horses or livestock are comfortable and safe
  • Receive alerts if sensor levels fall outside of your customized ranges

  • Semtech® LoRa® RF Module YL09 microcontroller with 32-Bit RISC processor
  • Color: White
  • Alert Temperature Range: -22.9°F – 221°F (-30.5°C – 105°C)
  • IP Rating: IP67
  • Data Displayed: Temperature, low-battery indicator
  • Multi-color status LED (rear)
  • SET button (rear)
  • Power: 2 Lithium Non-Rechargeable AAA batteries (3V DC)
  • Current Draw: ≤ 135mA (operating), ≤ 5uA (standby)
  • Dimensions:
  • Sensor Body (L x W x D): 2.44 x 2.44 x 0.87 inches (62 x 62 x 22 mm)
  • Cable Whip (L) : 3.28 feet (1 m)
  • Detection Probe (Dia x D): Φ0.2 x 0.98 inches (Φ5 x 25 mm)
  • Operating Temperature Range:
  • Sensor Body: -22°F – 158°F (-30°C – 70°C)
  • Cable Whip: -40°F – 221°F (-40°C – 105°C)
  • Detection Probe: -40°F – 221°F (-40°C – 105°C)
  • Operating Humidity Range:
  • Sensor Body: ≤95% (non-condensing)
  • Cable Whip: ≤100% 
  • Detection Probe: ≤100%


  • YoLink Hub or SpeakerHub (audio, talking hub) with an internet connection (wired Ethernet or 2.4GHz Wi-Fi). Refer to the hub user guide for additional information
  • Smartphone or tablet running iOS 9 or higher, Android 4.4 or higher
  • Tools Required: None 
  • Installation Difficulty Level: Super Easy
For full functionality, including for the app to work, YoLink devices must connect to at least one hub (YoLink Hub or SpeakerHub), and that hub must have an internet connection. Unless you are adding devices to an existing YoLink account, or unless your building is covered by an existing YoLink wireless network, please add one hub to your order.
(1) YoLink Outdoor Temperature Sensor w/Probe (lithium batteries included)
(1) Quick Start Guide
Sale Off
Temperature & Humidity Sensor, Hub Required!
Sale Off
X3 Smart Temperature & Humidity Sensor

Q: How often does the sensor check the temp for automation? Is the sensor only checked after a certain number of minutes?

 A: The sensor updates the app each hour, minimum, but also updates if any of the following occur:

At least 0.9 F degree change over a period longer than 1 minute

At least 3.6 F degree change within 1 minute

At least 5% humidity changes over a period longer than 1 minute

The device reaches a pre-set high or low alert level (set by the user)

Or the SET button on the device has been pressed.

Q: Is there an Alexa command that will read out the temperature?

 A: Yes, you can query Alexa. If your sensor name is ATTIC TEMP HUMIDITY, as it is in my own home, you can say "Alexa, what is the temperature of the attic temp humidity sensor?" And Alexa will return with "The attic temp humidity sensor temperature is 111 degrees."

Q: I see the YoLink hub is required for all smart features. Is there an alternate way to just connect wifi and monitor from ios without the hub?

 A: No, YoLink hub is required. YoLink smart devices use a special wireless technology based on LoRa, which can offer extreme long range (1000 feet compared to 100 for WiFi, outdoors, line-of-sight) and superior obstruction penetration including concrete and metal, but they do not use your WiFi. They need to wirelessly connect to one of our hubs.

This product is a member of the following collections:

Smart Fridge


Smart Aquarium