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Manual & tutorial


Indoor weather monitoring including carbon dioxide detection

4.9" LCD display & built-in Wi-Fi gateway

A dedicated display center for Ecowitt ecosystem sensors (more detail on compatibility table);

Measurement: CO2; Temperature & Humidity; Barometric;

Display content: 

Time&Week; Date or CO2 PPM Level, Backup Battery status ; Wi-Fi and RF signal status; 

Indoor Temperature and Humidity, or WN34 or WN35 or WH51 ( up to 8 channels);

Multi channel Temperature/Humidity sensors with Min&Max record.

Soil moisture (WH51), leaf wetness (WN35), multi channels sensor (WN30/WH31/WN34S/WN34L/WN36) can be displayed on LCD seamlessly. 

Cloud server content: 

Data and graph record: Relative & Absolute Pressure; Indoor Temperature and Humidity; Temp & Humidity with Multi-channel;


Website page:;;

APP: Ecowitt;

Weather servers support: ecowitt official cloud server;

Wunderground; Weathercloud; WeatherObservationWebsite; Customized (Homeseer; Homeassistant;);

Specifications (Sensor)

Measurement Range Accuracy Resolution Working condition
Temperature 0°C to 60°C (32°F to 140°F)  ± 0.3°C  0.1°C Recommend
-40°C to 0°C (-40°F to 32°F)  ± 1°C LCD display could fail 
Humidity 10% to 90%

± 5%

1% to 99%  ± 7% Normal

Sensor (backup): 2 x AA 1.5V battery (not included)

Specifications (Display)

Measurement Range Accuracy Resolution Working condition
Barometric 300 to 1100 hPa (8.85 to 32.5 inHg)

Absolute pressure: ±1.5hpa;

Relative pressure: ±2hpa

0.1hPa (0.01 inHg) Recommend
Temperature (Indoor) 0°C to 50°C (32°F to 122°F) ± 0.2°C (± 0.4°F) 0.1°C (0.1°F) Recommend
-40°C to 60°C (-40°F to 140°F) ± 0.6°C (± 1.0°F) 0.1°C (0.1°F) LCD display or CO2 could fail 
Humidity (Indoor) 30% to 70% ± 1.8% 1%
1% to 99% ± 3% Normal
CO2 0 to 40000 ppm ± (50 ppm + 5% of reading) 1ppm Recommend

Power supply: 5V ⎓ 1.0A 5.0W

Backup power: 2 x AA batteries (Support Min. 24 hours working)

RF Transmission

Transmission distance in open field: 150 m (500 ft.) depending on environment

RF frequency: 433/868/915/920 MHz depending on location

Sensor reporting interval: 61 seconds

Wi-Fi Transmission

Transmission distance in open field: 50 m (165 ft.) depending on router and environment

RF Frequency: 2.4 GHz

WLAN and Ethernet: 802.11 b/g/n (802.11n, Max 150 Mbps)

Updates on the Internet: Customize 1-5 minutes (recommend 1 minute)

Parts List

1* WH31 Sensor

1* WN1821 Display (Console)

1* USB to 2.5*0.7mm DC 5V power cord for display

Packaged information 

Weight: 500g

Battery: N/A

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