Introduction
The 20-in-1 Tuya WIFI Intelligent Air Quality Monitor is a multifunctional device designed to provide real-time monitoring of various indoor air quality parameters. It accurately detects CO2 concentration, CO concentration, TVOC value, HCHO value, PM2.5, PM1.0, and PM10 particulate matter, as well as ambient temperature and relative humidity. Featuring a large 2.8-inch color digital display, clock, and alarm functions, this monitor offers stable performance and high detection accuracy, making it ideal for homes, offices, schools, warehouses, and agricultural settings.

Package Contents
- 1 x Air Quality Monitor (Main Unit)
- Subunits (Quantity depends on purchased option: 3pcs or 5pcs)
- 1 x USB-TypeC Cable
- 1 x User's Manual
Setup Guide
1. Powering the Main Unit
The main unit is equipped with a built-in 3.7V, 2000mAh lithium battery. Before first use, ensure the main unit is fully charged using the provided USB-TypeC cable and a compatible power adapter (not included).
2. Installing Batteries in Subunits
Each subunit requires 2 x AAA batteries (not included). Open the battery compartment on the back of each subunit and insert the batteries, observing the correct polarity.
3. Initial Power-On
Press and hold the power button on the main unit to turn it on. The 2.8-inch TFT screen will light up, displaying initial readings.
4. Connecting to Tuya APP
- Download the 'Tuya Smart' or 'Smart Life' app from your smartphone's app store.
- Register or log in to your Tuya account.
- Ensure your main unit is powered on and in pairing mode (refer to the on-screen instructions or the app for specific pairing steps).
- In the app, tap '+' to add a new device. Follow the in-app instructions to connect your Air Quality Monitor.
- Once connected, the time and date on the main unit will automatically synchronize with your phone.

Operating Instructions
Display Modes
The main unit features a 2.8-inch color digital display with multiple display modes. You can switch between modes to view different information:
- Air Quality Parameter Display: Shows real-time readings for PM2.5, PM1.0, PM10, CO, CO2, TVOC, and HCHO, along with a color-coded air quality indicator.
- Time and Subunit Data Display: Shows current time, date, and temperature/humidity readings from up to 5 connected subunits.
Celsius/Fahrenheit units for temperature can be switched according to your preference.

Alarm Function
The monitor supports an alarm function. If any monitored parameter exceeds a preset abnormal threshold, an audible alarm will sound to alert you, allowing for timely adjustments to your environment.
Tuya APP Control
Through the Tuya app, you can:
- Monitor all 20 parameters in real-time from anywhere.
- View historical data for all parameters.
- Adjust display brightness.
- Manage and view data from up to 5 connected subunits.
20 Display Parameters
- PM2.5
- PM1.0
- PM10
- CO
- CO2
- HCHO
- TVOC
- Time
- Calendar
- Alarm clock
- Temp.CH1
- Humi.CH1
- Temp.CH2
- Humi.CH2
- Temp.CH3
- Humi.CH3
- Temp.CH4
- Humi.CH4
- Temp.CH5
- Humi.CH5
Maintenance
To ensure optimal performance and longevity of your air quality monitor:
- Keep the device clean by wiping it with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Ensure the ventilation holes on the main unit are not obstructed to allow for proper air circulation and heat dissipation.
- Replace subunit AAA batteries as needed to maintain continuous monitoring.
- Store the device in a cool, dry place when not in use for extended periods.
Troubleshooting
- No Display/Device Not Turning On: Ensure the main unit is fully charged. If using subunits, check if AAA batteries are correctly installed and not depleted.
- Inaccurate Readings: Ensure the device is placed in an area with good air circulation, away from direct drafts, heat sources, or strong chemical fumes. Allow the device to stabilize for a few minutes after powering on.
- APP Connectivity Issues: Verify that your main unit is within range of your Wi-Fi router and that your Wi-Fi network is stable (2.4GHz only). Restart the device and your router, then attempt to reconnect via the Tuya app.
- Alarm Sounds Frequently: Check the displayed parameter values. If they are consistently high, investigate the source of air pollution in your environment. You may need to adjust alarm thresholds in the app if they are too sensitive for your environment.
Specifications
| Parameter | Value |
|---|---|
| Color | White |
| Material | ABS |
| Subunit Quantity | 3pcs/5pcs (optional) |
| Display | 2.8 Inch TFT Screen |
| CO2 Detection Ranges | 400-6000PPM, ±50±15%PPM |
| CO2 Detection Accuracy | 1PPM |
| CO Detection Ranges | 0-500PPM |
| CO Detection Accuracy | 1PPM |
| TVOC Detection Ranges | 0-2.0mg/m3 |
| HCHO Detection Ranges | 0-0.6mg/m3 |
| PM2.5 Detection Ranges | 0-1000ug/m3 |
| PM2.5 Detection Accuracy | 1ug/m3 |
| PM1.0 Detection Ranges | 0-1000ug/m3 |
| PM10 Detection Ranges | 0-1000ug/m3 |
| Temperature Detection Ranges | -20-55℃, ±1℃ |
| Humidity Detection Ranges | 0-99%RH, ±3%RH |
| Main Unit Voltage | 3.7V |
| Subunit Voltage | 3.0V |
| Main Unit Battery | Built-in 3.7V, 2000mAh Lithium Battery |
| Subunit Battery | 2 * AAA Battery (Not Included) |
| Working Current | 280mA |
| Main Unit Size | 89 * 83 * 36mm / 3.5 * 3.3 * 1.4in |
| Main Unit Weight | 165g / 5.8oz |
| Subunit Size | 59 * 59 * 19mm / 2.3 * 2.3 * 0.7in |
| Subunit Weight | 40g / 1.4oz |
| Package Size | 195 * 160 * 72mm / 7.7 * 6.3 * 2.8in |
| Package Weight (3pcs Subunits) | 420g / 14.8oz |
| Package Weight (5pcs Subunits) | 500g / 17.6oz |
User Tips
- Optimal Placement: For the most accurate readings, place the main unit and subunits in central locations within the rooms you wish to monitor, away from windows, doors, and ventilation outlets that might skew readings.
- Leverage APP Monitoring: Utilize the Tuya app to its full potential. Regularly check historical data to identify trends in air quality and make informed decisions about ventilation or air purification.
- Battery Life: While the main unit has a built-in rechargeable battery, remember to keep spare AAA batteries for the subunits to ensure continuous, uninterrupted monitoring across all locations.
- Ventilation is Key: If the monitor consistently shows high levels of pollutants, consider increasing ventilation by opening windows or using air purifiers.

Warranty and Support
For any questions, technical assistance, or support regarding your 20-in-1 Tuya WIFI Intelligent Air Quality Monitor, please refer to the contact information provided by your retailer or the manufacturer. Keep your purchase receipt as proof of purchase for any warranty claims.