1. Ifihan
The Mastfuyi FY867 is a multifunctional, battery-powered instrument designed for precise environmental monitoring. It features a user-friendly interface, convenient button operation, and an intuitive 2.4-inch full-color HD display. This device accurately measures four critical environmental parameters:
- Iwọn otutu ibaramu: Iwọn otutu afẹfẹ lọwọlọwọ.
- Relative Humidity (%RH): The amount of moisture in the air relative to the maximum it can hold.
- Dew Point Temperature (DP): The temperature at which air becomes saturated with water vapor, leading to condensation. Crucial for preventing mold, rust, and damage in HVAC and storage.
- Wet Bulb Temperature (WB): The lowest temperature achievable by evaporating water into the air. Key for assessing heat stress and cooling system efficiency.
This instruction manual provides essential safety information, operating procedures, and technical specifications. Please read it carefully before using the product to ensure safe and effective operation.

2. Safety Operation Guidelines
Warning: Before using the product, please carefully read these safety guidelines.
- Before use, inspect the instrument and accessories for any damage or abnormality. Do not use the instrument if the housing is visibly damaged or the display is not functioning.
- Always follow the operating instructions provided in this manual when performing tests.
- Do not attempt to open the instrument or alter its internal wiring, as this may cause damage and void the warranty.
- When the display shows the low battery symbol, replace the batteries with new ones of the same specification promptly. If the instrument will not be used for an extended period, remove the batteries to prevent leakage.
- Do not store or use the device in environments with high temperature, high humidity, flammable or explosive materials, or strong electromagnetic fields.
3. Àwọn ẹ̀yà ara àti Ìfihàn
The Mastfuyi FY867 is designed for ease of use with clearly labeled components and a comprehensive display.

3.1. Physical Structure
- Iwadi: Located at the top, this houses the high-precision digital sensor for temperature and humidity measurements.
- Ifihan LCD: A 2.4-inch full-color HD screen for clear data visualization.
- Awọn bọtini iṣẹ: Located below the display for controlling various features.
- Instrument Housing: Made with durable, anti-slip, and impact-resistant silicone for superior grip and long-lasting performance.

3.2. LCD Display Area Description
The display provides real-time readings and status indicators:
- Auto Shut-off Symbol: Indicates automatic power-off function is active.
- Maximum Value Test Indication (MAX): Shows the highest recorded value.
- Minimum Value Test Indication (MIN): Shows the lowest recorded value.
- Data Hold Indication (HOLD): Indicates that the current reading is frozen on the screen.
- Itọkasi Batiri Kekere: Àwọn ìkìlọ̀ nígbà tí àwọn bátírì bá nílò àyípadà.
- Temperature Measurement Unit: Displays °C or °F.
- Relative Humidity Measurement Unit: Displays %RH.
- Agbegbe Ifihan iwọn otutu: Shows ambient temperature.
- Humidity Display Area: Shows relative humidity.
- Dew Point Temperature Area (DP): Shows dew point temperature.
- Wet Bulb Temperature Area (WB): Shows wet bulb temperature.
- Dew Point/Wet Bulb Measurement Units: Displays °C or °F for DP/WB.
4. Eto
4.1. Package Awọn akoonu
Nígbà tí o bá ń tú àwọn ohun èlò náà, jọ̀wọ́ rí i dájú pé gbogbo wọn wà níbẹ̀:
- MASTFUYI FY867 Digital Temperature Humidity Meter
- Afowoyi Olumulo (iwe-ipamọ yii)
- Screwdriver
- 3 x 1.5V AAA Batteries (not included, please purchase separately)
- Protective Carrying Case (optional, may vary by package)

4.2. Fifi sori batiri
The FY867 requires 3 x 1.5V AAA batteries.
- Wa yara batiri ni ẹhin ẹrọ naa.
- Lo screwdriver ti a pese lati ṣii ideri apo batiri naa.
- Insert three 1.5V AAA batteries, ensuring correct polarity (+/-) as indicated inside the compartment.
- Rọpo ideri kompaktimenti batiri ki o ni aabo pẹlu dabaru.
5. Awọn ilana Iṣiṣẹ
The FY867 is designed for intuitive operation with its clearly marked buttons.
5.1. Agbara Tan / Paa
- Tẹ awọn Bọtini agbara (
) once to turn the device on. - Tẹ awọn Bọtini agbara lẹẹkansi lati pa ẹrọ naa.
5.2. Automatic Power Off (APO)
- The instrument has a default automatic power-off time of 10 minutes to conserve battery.
- To disable the APO function: While the device is off, press and hold the DIMU bọtini ati ki o si tẹ awọn Bọtini agbara. The screen will display the "COU" symbol, indicating that APO has been successfully canceled.

5.3. Unit Switching (DP/WB and °C/°F)
- DP/WB Unit Toggle: Tẹ awọn DP/WB °C/°F button for less than 1 second to switch between Dew Point (DP) and Wet Bulb (WB) temperature displays.
- Temperature Unit Toggle (°C/°F): Tẹ mọlẹ DP/WB °C/°F button for 2 seconds or more to switch the temperature unit between Celsius (°C) and Fahrenheit (°F).

5.4. MAX/MIN Value Display
- Lakoko wiwọn, tẹ bọtini naa MAX / MIN bọtini to cycle through the maximum value (MAX), minimum value (MIN), and current normal value.
- When MAX or MIN is selected, the screen will continuously display the highest or lowest reading recorded since the device was powered on or the MAX/MIN function was reset.
5.5. Data Hold and Flashlight
- Idaduro data: Tẹ awọn Bọtini HOLD for less than 1 second to activate or deactivate the data hold function. When active, the current readings will be frozen on the display.
- Imọlẹ ina: Tẹ mọlẹ Bọtini HOLD for 2 seconds or more to turn the built-in flashlight on or off. This feature is useful for working in low-light conditions.

6. Awọn pato
Below are the detailed technical specifications for the Mastfuyi FY867 Digital Temperature Humidity Meter.

| Paramita | Sipesifikesonu |
|---|---|
| Nọmba awoṣe | FY867 |
| Agbara Iru | AAA Battery (3 x 1.5V AAA) |
| Sensọ Iru | High-precision digital sensor |
| Update Speed | 400ms |
| Ifihan Iru | DIGITAL (2.4-inch Full-Color HD Display) |
| Ojulumo ọriniinitutu Range | 0 ~ 99% RH |
| Ojulumo ọriniinitutu Yiye | ±3.0%RH (20%~80%), ±4.0%RH (0%~20%, 80%~99%) |
| Ipinnu Ọriniinitutu ibatan | 0.1% |
| Ibaramu otutu Ibiti | -20 ~ 60 ° C (-4 ~ 140 ° F) |
| Ambient Temperature Accuracy | ±1°C (0-45°C) / ±1.5°C (-20~0°C, 45~60°C) ±2°F (32~113°F) / ±3°F (-4~32°F, 113-140°F) |
| Ambient Temperature Resolution | 0.1°C / 0.2°F |
| Ìri Point otutu Range | -50 ~ 60 ° C (-58 ~ 140 ° F) |
| Dew Point Temperature Accuracy | ±1°C (0~45°C) / ±1.5°C (-50~0°C, 45~60°C) ±2°F (32~113°F) / ±3°F (-58~32°F, 113~140°F) |
| Dew Point Temperature Resolution | 0.1°C / 0.2°F |
| Awọn iwọn otutu Boolubu tutu | -20 ~ 60 ° C (-4 ~ 140 ° F) |
| Wet Bulb Temperature Accuracy | ±1°C (0~45°C) / ±1.5°C (-20~0°C, 45~60°C) ±2°F (32~113°F) / ±3°F (-4~32°F, 113~140°F) |
| Wet Bulb Temperature Resolution | 0.1°C / 0.2°F |
| Iwọn otutu to pọ julọ | 50°C - 69°C |
| Awọn iwọn | 180 x 61 x 33mm |
| Iwọn | 0.255 kg |
| Igbasilẹ data | Bẹẹni |
| Se Smart Device | Bẹẹni |
| Awọn iwe-ẹri | CE, FCC, RoHS |
| Ipilẹṣẹ | Orile-ede China |
7. Itọju ati Ipamọ
7.1. Gbogbogbo Itọju
- Jeki ẹrọ naa di mimọ ati ofe kuro ninu eruku ati idoti. Lo asọ asọ ti o gbẹ fun mimọ.
- Avoid exposing the device to extreme temperatures, direct sunlight, or sudden changes in temperature/humidity.
- Ma ṣe fi ẹrọ naa bọ omi tabi awọn olomi miiran.
7.2. Environmental Limitations
- Giga: Ti o to awọn mita 2000
- Ipele Idoti: Ipele 2
- Awọn iwọn otutu ti nṣiṣẹ ati ọriniinitutu: -20~60°C (-4~140°F), 45%-80%RH
- Ibi ipamọ otutu ati ọriniinitutu: -20~60°C (-4~140°F), 45%-80%RH
7.3. Itọju batiri
- Rọpo awọn batiri ni kiakia nigbati atọka batiri kekere ba han.
- If the instrument is not going to be used for an extended period (e.g., several months), remove the batteries to prevent potential leakage and damage to the device.
8. Laasigbotitusita
This section addresses common issues you might encounter with your Mastfuyi FY867.
- Ẹrọ ko ni agbara lori:
- Ensure batteries are correctly installed with the proper polarity.
- Check if the batteries are depleted and replace them if necessary. - Awọn kika ti ko pe:
- Allow the meter to stabilize for a period (e.g., 10-15 minutes) after moving it to a new environment, especially if there are significant temperature or humidity differences.
- Ensure the sensor probe is clean and unobstructed.
- Verify that the device is not exposed to direct heat sources, strong drafts, or direct sunlight during measurement. - Display is blank or shows error:
- Ṣayẹwo awọn ipele batiri ki o rọpo ti o ba kere.
- If the housing is damaged, discontinue use and contact support. - Automatic power off is too frequent/infrequent:
- Tunview section 5.2 on how to enable or disable the Automatic Power Off function.
If you encounter persistent issues not covered here, please contact Mastfuyi customer support.
9. Awọn imọran olumulo
- Akoko Iduroṣinṣin: For the most accurate readings, especially when moving the meter between environments with different temperatures or humidity levels, allow the device to stabilize for at least 10-15 minutes in the new location.
- Itọju Sensọ: Keep the sensor probe clean and free from dust, lint, or any obstructions that could affect air circulation and measurement accuracy.
- Ibi to dara julọ: When monitoring an area, place the meter away from direct heat sources, air conditioning vents, or open windows to get a representative reading of the general environment.
10. Atilẹyin ọja ati Support
Mastfuyi products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please contact the manufacturer directly.
Olupese: Huizhou City Fu Yi Electronic Technology Co., Ltd.
Imeeli: mkfuyi@mastfuyi.com
Webojula: www.mastfuyi.com
Adirẹsi: 4F and 5F, No.5 Building, Yinghui Technology Park, No.6 Dongsheng North Road, Chenjiang Sub-district, Zhongkai Hi-tech Zone, Huizhou City, Guangdong Province, China.
Iwe itọnisọna alaye olumulo ni ọna kika PDF tun wa fun igbasilẹ: Ilana olumulo (PDF)





