1. Introduction
The MASTFUYI FY886B is a versatile, battery-powered digital moisture testing meter designed for measuring moisture content in various materials, as well as ambient temperature and humidity. Its intuitive LED display and easy-to-operate buttons make it suitable for both professional and DIY applications in woodworking and construction.
This manual provides detailed instructions for the safe and effective use of your FY886B moisture meter.
Figure 1: MASTFUYI FY886B Digital Wood Moisture Meter
2. Package Contents
Upon opening the package, please verify that all items are present and in good condition:
- MASTFUYI FY886B Moisture Meter
- User Manual
- Protective Carrying Case
- Spare Measurement Pins (1 pair)
- Mini Wrench/Tweezer for Pin Replacement
Figure 2: Contents of the FY886B package
3. Setup
3.1 Battery Installation
- Locate the battery compartment on the back of the device.
- Open the battery compartment cover.
- Insert one 9V (6F 22) battery, ensuring correct polarity. (Battery not included in package).
- Close the battery compartment cover securely.
Video 1: Unboxing and Battery Installation of the FY886B Moisture Meter.
3.2 Initial Power On
- Press the red Power On/Off button (5) to turn on the device.
- Remove the protective film from the LED display (1).
- The LED display will light up, showing ambient temperature, humidity, and moisture level indicators.
4. Operating Instructions
4.1 Device Overview
Figure 3: FY886B Moisture Meter Parts and Functions
| No. | Description |
|---|---|
| 1 | LED display |
| 2 | °C/°F selection button |
| 3 | Data hold button |
| 4 | Mode selection button |
| 5 | Power on/off button |
| 6 | Temperature display area |
| 7 | Under-voltage prompt |
| 8 | Data locking |
| 9 | Data display area |
| 10 | General timber indicator |
| 11 | Building material indicator |
| 12 | Low moisture indicator |
| 13 | Medium moisture indicator |
| 14 | High moisture indicator |
4.2 Measuring Moisture Content
- Select Measurement Mode: Press the 'MODE' button (4) to switch between Wood Moisture Measurement (indicated by a tree icon, 10) and Building Material Moisture Measurement (indicated by a brick wall icon, 11). The FY886B features universal modes for both, eliminating the need to distinguish between hardwoods/softwoods or various building materials.
- Insert Pins: Carefully insert the two sharp measurement pins into the material you wish to test. Ensure good contact for accurate readings.
- Read Measurement: The moisture percentage will be displayed in the Data Display Area (9). The device also provides visual alerts (12, 13, 14) for LOW, MID, or HIGH moisture levels.
- Data Hold: Press the 'HOLD' button (3) to freeze the current reading on the display. Press it again to release the hold.
Figure 4: Wood Moisture Measurement in progress.
Figure 5: Building Material Moisture Measurement in progress.
Figure 6: Easy-to-read Color LED Screen with Data Hold Function.
4.3 Temperature Unit Selection
Press the '°C/°F' button (2) to switch between Celsius (°C) and Fahrenheit (°F) for temperature display.
4.4 Visual Alerts for Moisture Levels
The device provides instant visual alerts (LOW, MID, HIGH) to indicate the level of moisture risk. Refer to the table below for interpretation:
Figure 7: Moisture Level Visual Alerts and Thresholds
| Materials Type | Low | Mid | High |
|---|---|---|---|
| Wood | < 17% | 17% ~ 20% | > 20% |
| BLD (Building Materials) | < 12% | 12% ~ 16% | > 16% |
5. Maintenance
5.1 Replacing Measurement Pins
The measurement pins are replaceable. If the pins become dull or damaged, they can be replaced using the provided mini wrench or tweezer. A pair of spare pins is included in the box.
- Carefully unscrew the old pins using the mini wrench or tweezer.
- Insert the new pins and screw them in firmly.
Figure 8: Replacing Measurement Pins
5.2 Cleaning and Storage
- Wipe the device with a soft, dry cloth after each use. Do not use abrasive cleaners or solvents.
- Ensure the pins are clean and dry before storage.
- Store the meter in its protective carrying case in a dry environment when not in use.
- Remove the battery if the device will not be used for an extended period to prevent leakage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on | Dead or incorrectly installed battery | Replace the 9V battery and ensure correct polarity. |
| Inaccurate readings | Poor contact with material, dull pins, or incorrect mode selection | Ensure pins are fully inserted and make good contact. Replace pins if dull. Verify correct measurement mode (Wood/BLD). |
| "Under-voltage prompt" (7) displayed | Battery voltage is below approximately 6.2V | Replace the 9V battery immediately. |
| Device turns off automatically | Automatic shutdown function activated | This is normal behavior. If no button is pressed for more than 10 minutes, the device will power off to save battery. Turn it back on with the Power button. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Number | FY886B |
| Display Type | DIGITAL (Color LED Screen) |
| Backlight | Yes |
| DIY Supplies | Woodworking |
| Wood Moisture Measurement Range | 0% ~ 60% |
| Building Moisture Measurement Range | 0% ~ 60% |
| Moisture Measurement Accuracy | ±2.0% |
| Material Moisture Sampling Rate | 240m/s |
| LCD Refresh Time (Moisture) | 1.5s |
| Temperature Sampling Rate | 240m/s |
| LCD Refresh Time (Temperature) | 1.5s |
| Power Supply | 1 * 9V (6F 22) Battery (not included) |
| Low Voltage Indication | Battery below approx. 6.2V |
| Automatic Shutdown | After 10 minutes of no button operation |
| Dimensions (L x W x D) | 165mm x 55mm x 30mm |
| Weight | 0.204 kg |
| Origin | Mainland China |
| Certifications | CE, FCC, RoHS |
8. User Tips
- For consistent readings, ensure the measurement pins are inserted to the same depth each time.
- Always test multiple spots on a material to get a comprehensive understanding of its moisture content.
- When measuring wood, consider the wood type (hardwood vs. softwood) and its typical dry moisture content for your specific application.
- Keep the protective cap on the pins when not in use to prevent damage and accidental injury.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact information provided by your retailer or the manufacturer's official website. Keep your purchase receipt as proof of purchase.
