The Ecowitt WN1820/WN1821 comprises two components the WN31 temperature/humidity sensor and also the new design WN1820 colour display or WN1821 with CO2 monitor both inbuilt indoor temperature and humidity sensor. The compact LCD colour display includes inbuilt temperature, humidity, atmospheric pressure sensors and on the WN1821 a CO2 level sensor. The console also includes built in WiFi to allow for data to be uploaded to online services. This comes with the WN31 temperature and humidity sensor which can be located up to 100m from the receiving console either inside or outside. This indoor data, along with the additional sensor data can be uploaded to the FREE Ecowitt service via WiFi along with many optional sensors that can be added. All of this can be viewed on an iOS or Android device or in a traditional browser via the Ecowitt weather website.
The Ecowitt WN1820/WN1821 comprises two components the WN31 temperature/humidity sensor and also the new design WN1820 colour display or WN1821 with CO2 monitor both inbuilt indoor temperature and humidity sensor. The compact LCD colour display includes inbuilt temperature, humidity, atmospheric pressure sensors and on the WN1821 a CO2 level sensor. The console also includes built in WiFi to allow for data to be uploaded to online services. This comes with the WN31 temperature and humidity sensor which can be located up to 100m from the receiving console either inside or outside. This indoor data, along with the additional sensor data can be uploaded to the FREE Ecowitt service via WiFi along with many optional sensors that can be added. All of this can be viewed on an iOS or Android device or in a traditional browser via the Ecowitt weather website.
in 4 offers
The lowest price for Ecowitt WN1820 / WN1821 with WiFi & Temperature & Humidity Sensor WN1821 Temperature+Humidity+CO2 right now is , compared across 2 retailers.
Ecowitt WN1820 / WN1821 with WiFi & Temperature & Humidity Sensor WN1821 Temperature+Humidity+CO2
The Ecowitt WN1820/WN1821 comprises two components the WN31 temperature/humidity sensor and also the new design WN1820 colour display or WN1821 with CO2 monitor both inbuilt indoor temperature and humidity sensor. The compact LCD colour display includes inbuilt temperature, humidity, atmospheric pressure sensors and on the WN1821 a CO2 level sensor. The console also includes built in WiFi to allow for data to be uploaded to online services. This comes with the WN31 temperature and humidity sensor which can be located up to 100m from the receiving console either inside or outside. This indoor data, along with the additional sensor data can be uploaded to the FREE Ecowitt service via WiFi along with many optional sensors that can be added. All of this can be viewed on an iOS or Android device or in a traditional browser via the Ecowitt weather website.
The Ecowitt WN1820/WN1821 comprises two components the WN31 temperature/humidity sensor and also the new design WN1820 colour display or WN1821 with CO2 monitor both inbuilt indoor temperature and humidity sensor. The compact LCD colour display includes inbuilt temperature, humidity, atmospheric pressure sensors and on the WN1821 a CO2 level sensor. The console also includes built in WiFi to allow for data to be uploaded to online services. This comes with the WN31 temperature and humidity sensor which can be located up to 100m from the receiving console either inside or outside. This indoor data, along with the additional sensor data can be uploaded to the FREE Ecowitt service via WiFi along with many optional sensors that can be added. All of this can be viewed on an iOS or Android device or in a traditional browser via the Ecowitt weather website.
The all-time low was $109.99 on 5 Nov 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 5 Nov 2026.
Last updated at 05/11/2026 16:58:36
Ecowitt WN1821 Wi-Fi Weather Station LCD Display Console, Could Be Used As Wi-Fi Gateway with Display, Built-in Indoor Thermo-Hygro Sensor and CO2
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Wn1821 Wi-fi Weather Station Lcd Display Console, Could Be Used As
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
| Wireless | Yes |
| With Humidity Sensor | Yes |
Ecowitt WN1821 Wi-Fi Weather Station LCD Display Console, Could Be Used As Wi-Fi Gateway with Display, Built-in Indoor Thermo-Hygro Sensor and CO2
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Wn1821 Wi-fi Weather Station Lcd Display Console, Could Be Used As
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
| Wireless | Yes |
| With Humidity Sensor | Yes |
