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When you buy two items, you get one for just 7 €! Smart thermometer Xiaomi Smart Temperature and Humidity Monitor 3 with high accuracy and a large LCD display

26. November 2025 3 min read 0 comments

Almost everyone has a thermometer at home. Xiaomi thinks of that too, and under its Mijia brand it has introduced the third generation of the popular Xiaomi Mijia Smart Thermometer. What does it offer?

Buying multiple units is even more worth it!

Xiaomi Smart Temperature and Humidity Monitor 3 is currently available from an international seller on the AliExpress marketplace. Shipped from a Chinese warehouse, with delivery in just 10-15 working days from dispatch.

You can also find it with the local retailer Smarty.sk. The advantage is express delivery, a full 2-year warranty, or the option to return the item.

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Xiaomi Smart Temperature and Humidity Monitor 3

Xiaomi Smart Temperature and Humidity Monitor 3
17,89 €You save 3,16 €
14,73 €

Price history

0,70 €cheaper than the average price
Cheapest 14,73 €Most expensive 16,12 €
Buying on AliExpress for the first time? See the guide!
Updated 26. 11. 2025 on 11:19
TIP15-day delivery via Aliexpress Standard Shipping

For this product, Aliexpress Standard Shipping is available with guaranteed delivery within 15 days. This is the most reliable delivery method and, in most cases, the parcel is handled by a courier company. We tested the 15-day delivery in real life.

When ordering from the Chinese warehouse, AliExpress will add the customs duty in your cart—approximately 3,70 € per order. When you receive the package, you won’t pay anything extra.

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Buying on AliExpress for the first time?

This process is done through the AliExpress mobile app, where most people shop. Two things matter: don’t use Buy now and enter the coupon only in the order summary in the Promo code field. After you click Pay now, you can’t add it anymore.

  1. Copy the code and click GET THE DISCOUNTIn our article, copy the coupon and click the button GET THE DISCOUNT. The link will take you directly to the product in the AliExpress app.
  2. Use Add to cart, not Buy nowOn the product card, scroll down and click Add to cart. Don’t use the Buy now button—this skips the cart, so later you won’t have a place to enter the coupon. Before that, make sure the variant is correct: color, version, and whether it ships from an EU warehouse.
  3. Continue to Checkout via the cartA pop-up will appear: Added to cart!—tap Check it out. If it disappeared, open the cart using the icon in the bottom-right corner. In the cart, check the product and quantity, then tap the red Checkout button. Only the items marked with the red circle are included.
  4. Fill in your address and card, then look for Promo codeIn the order summary, first enter the delivery address and payment card at the top. Below that, there’s a line Promo code — expand it with the arrow on the right.
    Promo code line in the AliExpress app order summary
    Look for this line under the address and payment method.
  5. Paste the code and confirm ApplyIn the field Promo code paste the copied code and click the black Apply. The code is case-sensitive and must not contain spaces.
    Promo code box with the code and the Apply button in the AliExpress app
    Paste the code into the field and confirm by clicking the Apply button.
  6. Check your savings and payIn the section Summary expand the line Saved — you’ll see the applied coupon there as AliExpress coupons/codes. Only when Total is really lower, click Pay now.
    Saved line with the applied coupon and reduced Total in the AliExpress app
    The applied coupon will show up in the Saved line and reduce the Total.
Apply the discount again in the order summary. After you click Pay now, you can’t add a coupon anymore. If Apply shows an error, the code has either expired, doesn’t apply to your item, or your order doesn’t meet the minimum amount.
Store Coupon also belongs in the same field. — a coupon from the seller itself, which isn’t always available and changes day to day. It can’t be combined with an AliExpress coupon, so try both and go with the one that gives you more. Coins are added automatically.

Minimalist dimensions and a larger display

The dimensions are truly compact: 79.6 x 70.2 x 14.5 mm with a weight of 72 grams, so it’s made of plastic. Thanks to its size, it won’t get in the way anywhere—on the contrary, it looks very minimalist.

On the sides, you’ll find small buttons to switch modes, and on the back there’s a stick-on wall mount. Xiaomi Mijia Smart Temperature and Humidity Meter 3 will be available in only one color—white.

In front there is a black-and-white LCD display with dimensions of 62.6 x 53.2 mm. However, this time it’s much larger than on the previous generation. It shows things like temperature, humidity, time, and the current date.

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Accurate Sensirion sensor

So the thermometer displays temperature and humidity information, with a built-in accurate Sensirion sensor that can detect temperature fluctuations of 0.1 °C and humidity changes of 1%, which is a very solid performance for such a small device.

As the name suggests, the Xiaomi Mijia Smart Temperature and Humidity Meter 3 is smart. That means you can pair it with the Mi Home app via Bluetooth technology. For remote control, you’ll need a Bluetooth Mesh gateway, which the thermometer connects to—then you can access the thermometer even outside your home through the internet.

Wireless use and battery life up to 1,5 years

The thermometer doesn’t connect anywhere—it’s powered by a CR2450 coin cell battery, which should last about 1.5 years, which is a nice value. After that, you just replace it with a new one and you’re good for another year and a half.

What do you think of a practical thermometer like this? Could you imagine having it somewhere in your home? Let us know in the comments below the article. Follow the XiaomiPlanet website, subscribe to our newsletter, and join our Facebook group, where we build an active Xiaomi community.

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