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BRAND:  yolink        MODEL: YS8003     


Smart thermometer and hygrometer.

Please note: this product requires a YoLink Hub or SpeakerHub.




Free U.S. Shipping, Orders $50 & Up

Hassle-Free 60 Day Returns

2-Year Warranty

Easy Do-It-Yourself Installation

U.S. Phone Support Available

100% Satisfaction Goal



Home Assistant

Raedius Web Console

Customer Reviews

Based on 34 reviews
Exactly what I looked (and more) for to watch cooler temps

YoLink is tied with Wyze as lesser-known brands that offer top innovation for low prices.

Randy Feagins
Great sensor

Works well

Rick D Miller
Great product, great price

These YoLink sensor alerts are the best thing since sliced bread. I have a mailbox that is over 200' from my house; I was tired of making trips to it in the rain and snow only to find that I had no mail or that it had not gone yet. YoLink has solved that problem. I would buy it again in a heartbeat.
Rick M
Benton KY.

Very good quality device

This is a fantastic product. Works just as described. I tested the wifi and installed a temperature transmitter 1/4 mile from my hub and it works perfectly.

Accurate and easy to set up.

Easy to install and work as expected.


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


  • Temperature and humidity displayed on the YoLink app
  • LCD display shows current temperature (Celsius or Fahrenheit) and current humidity (%)
  • Extremely accurate temperature and humidity figures (+/- .3 degrees Celsius and +/- 3 percent humidity)
  • Self-calibration available via the YoLink app
  • Portable; may be placed anywhere in your home or wall-mounted
  • High/low temperature alerts
  • High/low humidity alerts
  • Historical temperature and humidity graphs displayed in hourly and daily figures
  • Wireless operation; no 120V outlet or wiring required
  • Battery-powered (two standard alkaline AAA batteries, included)
  • Up to 2 years of battery life, compared to 1 year for other brands
  • IFTTT, Home Assistant, Alexa (limited to voice queries of status) integration
  • YoLink’s industry-leading long range communication and low-power operation
  • Exceptional value; accurate temperature and humidity sensor in one smart device at a great price
  • Works with the convenient and user-friendly YoLink app
  • Know the current temperature and humidity 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 and/or humidity levels via emails or phone 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 alkaline batteries (2 AAA batteries); no Lithium or special batteries required
  • Extremely easy and fast installation using the YoLink app with Scan & Play
  • Use the YoLink smartphone app to remotely monitor the temperature and humidity 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 building, barns, greenhouse, etc.
  • Place one in each room your wish to keep an eye on the temperature and humidity.
  • Place the sensor in a basement or other area subject to mold and mildew growth due to high humidity levels. Identify problem areas before expensive repairs are required
  • Use the sensor and app automation features to automatically turn on the exhaust fan in your bathroom during hot showers and baths
  • Use the sensor and app automation features to automatically turn a humidifier or dehumidifier on or off based on sensor levels
  • Monitor your cigar humidor, wine cellar, or any other temperature- and/or humidity-sensitive item or area
  • Place inside a refrigerator or freezer, to prevent the loss of expensive refrigerated and frozen foods due to equipment failure or power loss
  • Monitor the temperature of rooms or buildings without temperature control, for example, receive a low-temp alert before water pipes freeze
  • 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

Controller: Semtech® LoRa® RF Module YL09 microcontroller with 32-Bit RISC processor

Color: White

Display: Monochromatic LCD

Data Displayed: Temperature, humidity, low-battery indicator

Dimensions (L x W x D): 2.44 x 2.44 x 0.93 inches (62 x 62 x 23.5 mm)

User Interface:

Multi-color status LED (rear)

SET button (rear)

Power: 2 AAA batteries (3V DC)


   Operating Temperature Range: -22°F - 140°F (-30°C - 60°C)

   Operating Humidity Range: ≤95% (non-condensing)

   Intended for indoor use only



  • 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 (Unless wall-mounting, optional)
  • 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 Temperature & Humidity Sensor (batteries included)
(1) Quick Start Guide

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