1. Product Overview
The MASTFUYI WS0850 is a sophisticated 3-sensor weather station designed to provide accurate indoor and outdoor temperature and humidity readings, along with weather forecasts. It features a 5-inch HD color display that also functions as a desktop clock and alarm clock. With three remote sensors, you can monitor environmental conditions in multiple locations simultaneously.
Figure 1: Main unit and three remote sensors.
Key Features:
- 5-inch HD Color Display: Clear and vibrant display of all information.
- 3 Remote Sensors: Monitor temperature and humidity in up to three different locations.
- Indoor/Outdoor Temperature & Humidity: Real-time readings for comprehensive environmental monitoring.
- Weather Forecast: Predicts weather fluctuations for the next 24-48 hours.
- Alarm Clock & Snooze Function: Integrated timekeeping with dual alarm settings.
- Comfort Indicator: Displays comfort levels based on humidity.
- MAX/MIN Record: Automatically records highest and lowest temperature/humidity.
- Adjustable Backlight: 3 levels of brightness for optimal viewing.
- Dual Power Supply: Operates via power adapter or AAA batteries.
2. Package Contents
Please check the package carefully to ensure all items are present and undamaged.
- 1 x MASTFUYI WS0850 Main Weather Station Unit
- 3 x Remote Sensors
- 1 x Power Adapter (US-Plug or EU-Plug, depending on region)
- 1 x User Manual (this document)
Figure 2: Product variants (US-Plug and EU-Plug versions shown).
3. Setup Instructions
3.1 Powering the Main Unit
- Using Power Adapter (Recommended for continuous backlight): Connect the included power adapter to the main unit and plug it into a standard wall outlet. The display will light up.
- Using Batteries (for portable use or backup): Open the battery compartment on the back of the main unit and insert 3 x AAA batteries (not included), observing the correct polarity. The backlight will not remain on continuously in battery mode to conserve power.
Figure 3: Power supply options for the main unit.
3.2 Powering the Remote Sensors
Each remote sensor requires 2 x AAA batteries (not included). Open the battery compartment on the back of each sensor and insert the batteries, ensuring correct polarity. The sensors will automatically begin transmitting data.
3.3 Sensor Placement
Place the remote sensors in desired locations to monitor temperature and humidity. The sensors are designed for both indoor and outdoor use. Consider the following for optimal performance:
- Transmission Range: The sensors have a transmission range of up to 330 feet (100 meters) in open areas and approximately 100 feet (30 meters) under most conditions (e.g., through walls).
- Outdoor Placement: For outdoor sensors, choose a shaded, dry location away from direct sunlight and precipitation to ensure accurate readings and prolong sensor life. Avoid placing near heat sources or vents.
- Indoor Placement: Place sensors in rooms where you want to monitor conditions, such as a baby room, living room, office, greenhouse, or cellar.
- Obstacles: Walls, electronic devices, and large metal objects can interfere with wireless transmission. Try to minimize such obstacles between the main unit and the sensors.
Figure 4: Examples of remote sensor placement.
Figure 5: Wireless transmission range illustration.
3.4 Initial Synchronization
Once both the main unit and sensors are powered, the main unit will automatically search for and connect to the remote sensors. This may take a few minutes. Ensure sensors are within range during initial setup.
4. Operating Instructions
4.1 Display Layout
The 5-inch HD color display shows various information clearly. The display is typically divided into sections for indoor readings, outdoor readings (for each of the 3 channels), time, date, and weather forecast.
Figure 6: Multi-function display overview.
4.2 Weather Forecast Function
The weather station provides a forecast for the next 24-48 hours, indicated by graphical symbols. Please note that this is a prediction and not current weather conditions.
- Sunny
- Partly Cloudy
- Cloudy
- Rainy
Figure 7: Weather forecast symbols.
4.3 Alarm Clock & Snooze
The weather station includes two independent alarm settings:
- Alarm 1: Typically set for Monday-Friday.
- Alarm 2: Typically set for Saturday-Sunday.
Refer to the device's buttons (e.g., 'SET', 'MODE', 'ALARM') for specific instructions on setting and activating alarms and the snooze function. The snooze duration is usually a fixed interval (e.g., 5-10 minutes).
Figure 8: Alarm Clock & Snooze function.
4.4 Comfort Indicator
The display features a comfort indicator that visually represents the current humidity level, helping you maintain a comfortable indoor environment:
- Dry: Relative Humidity (RH) < 45%
- Comfortable: 45% < RH < 65%
- Wet: RH > 65%
Figure 9: Comfort Indicator details.
4.5 MAX & MIN Record
The weather station automatically records the maximum and minimum temperature and humidity values over a 24-hour period. These records are cleared automatically every 24 hours in '24h clear mode' or can be cleared manually. Consult the device buttons for manual clearing instructions.
Figure 10: MAX & MIN record display.
4.6 Backlight Adjustment
The main unit features a 3-level adjustable backlight brightness (100%, 75%, 50%) for comfortable viewing in various lighting conditions. Use the dedicated backlight button (often labeled 'LIGHT' or similar) to cycle through brightness levels. When powered by batteries, the backlight will typically only illuminate briefly to conserve power.
Figure 11: Backlight brightness levels.
4.7 Unit Selection (Fahrenheit/Celsius)
The temperature display can be switched between Fahrenheit (°F) and Celsius (°C). Look for a dedicated button (often labeled '°C/°F') or a setting within the menu to change the unit.
5. Maintenance
5.1 Cleaning
- Wipe the main unit and sensors with a soft, damp cloth. Do not use abrasive cleaners or solvents, as they may damage the plastic components or display.
- Ensure no moisture enters the battery compartments or other openings.
5.2 Battery Replacement
- Remote Sensors: Replace the 2 x AAA batteries in each remote sensor when the low battery indicator appears on the main unit's display for that channel.
- Main Unit (if using battery mode): Replace the 3 x AAA batteries in the main unit when the display dims significantly or stops functioning.
- Always use new batteries of the same type and replace all batteries in a unit at the same time.
- Dispose of old batteries responsibly according to local regulations.
5.3 Storage
If storing the weather station for an extended period, remove all batteries from both the main unit and the remote sensors to prevent leakage and damage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Main unit display is blank or dim. | No power, low batteries, or power adapter issue. |
|
| Remote sensor readings not appearing or inaccurate. | Sensor out of range, low sensor batteries, interference, or sensor not synchronized. |
|
| Weather forecast seems incorrect. | Weather forecast is a prediction, not real-time. | The weather forecast function predicts conditions for the next 24-48 hours based on atmospheric pressure changes, not current satellite data. It may not always match real-time conditions perfectly. |
| Time/Date is incorrect. | Not set correctly after power loss or initial setup. | Refer to the device's buttons (e.g., 'SET', 'MODE') to manually adjust the time and date. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Mastfuyi |
| Model Number | WS0850 |
| Theory | Thermometer Hygrometer |
| Use | Household |
| Display Type | DIGITAL |
| Display Size | 5-inch HD Color Display (approx. 5.3 inches wide, 3.7 inches high) |
| Power Type (Main Unit) | Power Adapter (Included) or 3 x AAA Batteries (Not Included) |
| Power Type (Remote Sensors) | 2 x AAA Batteries per sensor (Not Included) |
| Battery Included | No |
| Certification | CE, FCC, RoHS |
| Style | Standing and Wall Hanging |
| Indoor Temperature Range | 32 to 140 °F (0 to 60 °C) |
| Indoor Temperature Accuracy | ±2°F / ±1°C |
| Indoor Temperature Resolution | 0.1 °F / 0.1 °C |
| Outdoor Temperature Range | -40 to 140 °F (-40 to 60 °C) |
| Outdoor Temperature Accuracy | ±2°F / ±1°C |
| Outdoor Temperature Resolution | 0.1 °F / 0.1 °C |
| Indoor/Outdoor Humidity Range | 10 to 99 % RH |
| Indoor/Outdoor Humidity Accuracy | ±5% |
| Indoor/Outdoor Humidity Resolution | 1% |
| Wireless Transmission Range | Up to 330 ft (100 m) in open area; 100 ft (30 m) under most conditions |
| Package Dimensions | 20 cm (L) x 12 cm (W) x 9 cm (H) |
| Package Weight | 0.45 kg |
Figure 12: Temperature and Humidity Specifications.
8. User Tips
- Optimal Sensor Placement: For the most accurate outdoor temperature, place the sensor in a shaded area, protected from direct sunlight and rain. For indoor sensors, avoid placing them near windows, doors, or heating/cooling vents.
- Battery Life: To maximize battery life in remote sensors, ensure they are placed within optimal transmission range and avoid frequent temperature extremes.
- Backlight Usage: If you prefer a continuously lit display, use the power adapter. Battery power is best for intermittent viewing or portable use.
- App Connectivity: This weather station is a standalone device and does not connect to a smartphone application. All functions are controlled directly on the main unit.
9. Warranty and Support
For warranty information and technical support, please refer to the documentation provided at the time of purchase or contact the seller directly. Keep your purchase receipt as proof of purchase.
