Check coupons or create price alert down below. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
temperature accuracy: 0.1 degrees, humidity accuracy: 0.1 percent RH
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($14.44): BGherra
2. ($14.44): BG834294
3. ($15.99): 13f142
4. ($15.99): BG11SHOP
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): bgsport, 87c97f, 502C6B, 15NATURE, BGTR15, BGBG4683, BGFDJ, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGBG7937
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Xiaomi Temperature Humidity Sensor [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi Temperature Humidity Sensor.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).