SPECIFICATIONS

8-Leaf Wind Wheel & Dual Temperature Sensors

8-Leaf Wind Wheel Design

The HP-866B-WM features an 8-leaf wind wheel with low friction bearing technology for more accurate wind speed measurement.

Advantages of 8-Leaf Design

Feature Benefit
8-Leaf Vane More sensitive to low wind speeds
Low Friction Bearing Reduced resistance for accurate readings
Upgraded Design More accurate than traditional designs
Fast Response Instantaneous wind speed detection
Dual Temperature Sensors

The HP-866B-WM is equipped with dual temperature sensors for improved accuracy compared to single sensor designs.

Advantages of Dual Sensors

Feature Benefit
Two Sensors Improved measurement accuracy
Cross-Reference Reduces measurement errors
Redundancy More reliable readings
Better Response Faster temperature detection
Measurement Tips

Keep the wind wheel unobstructed during measurement

Hold the device steady for accurate readings

For best results, hold the device at arm's length

Avoid measuring near heat sources or reflective surfaces

The wind wheel should be perpendicular to the wind direction

Wind Speed Measurement

Measures both current and average wind speeds

Records maximum and minimum readings

Wind chill calculation based on temperature and wind speed

5 different units for global use

Barometer & Altimeter Functions

Barometric Pressure Measurement

The HP-866B-WM measures barometric pressure from 10 to 1100 hPa with multiple unit options.

Parameter Value
Measurement Range 10 to 1100 hPa
Units hPa, inHg, mbar
Barometer Indicator Visual display on screen
Barometric Pressure Units

Unit Full Name Common Use
hPa Hectopascal International standard
mbar Millibar Common weather unit
inHg Inches of Mercury US standard
Altitude Measurement

The device measures altitude up to 9000m with both metric and imperial units.

Parameter Value
Measurement Range 0 to 9000m
Units m (meters) / ft (feet)
How Barometer Works

Measures atmospheric pressure

Converts pressure to altitude reading

Displays current altitude

Useful for hiking, climbing, and outdoor activities

How to Use Barometer/Altimeter

Press MODE button to select BARO or ALT mode

View current barometric pressure or altitude reading

Long press to store barometric data

Long press to adjust altitude settings

Applications

Hiking and mountain climbing altitude tracking

Weather monitoring and forecasting

Outdoor sports altitude measurement

Aviation and flight planning

Building and construction site elevation

Temperature Humidity & Dew Point Measurement

Temperature Measurement

The HP-866B-WM measures ambient temperature with dual sensor accuracy.

Parameter Value
Measurement Range -10°C to 45°C / 14°F to 113°F
Accuracy ±2°C
Resolution 0.2°C
Units °C / °F switchable
Humidity Measurement

The device measures relative humidity for comprehensive environmental monitoring.

Parameter Value
Measurement Range 5% to 95% RH
Resolution 0.1% RH
Dew Point Calculation

The HP-866B-WM automatically calculates and displays dew point temperature.

Parameter Value
Display DP indicator on screen
Units °C / °F
Wind Chill Calculation

The device calculates wind chill based on temperature and wind speed.

Parameter Value
Display WIND CHILL indicator
Units °C / °F
Applications for Dew Point & Wind Chill

Feature Application
Dew Point Predict condensation, assess comfort levels
Wind Chill Evaluate cold weather safety, outdoor planning
TRH Mode Display

In TRH mode, the LCD shows:

Temperature (°C/°F)

Relative Humidity (RH%)

Dew Point (DP-°C/DP-°F)

Wind Chill (WCL-°C/WCL-°F)

MAX/MIN/AVG Recording & Backlight

MAX/MIN/AVG Recording Mode

The HP-866B-WM records current, maximum, minimum, and average wind speed values for comprehensive analysis.

How to Use MAX/MIN/AVG Mode

Press MAX/MIN/AVG button to cycle through modes

"CURRENT" – displays real-time wind speed

"MAX" – displays the maximum wind speed recorded

"MIN" – displays the minimum wind speed recorded

"AVG" – displays the average wind speed over 15 seconds

Applications for MAX/MIN/AVG

Mode Application
MAX Find peak wind speeds for safety assessment
MIN Identify minimum air flow in HVAC systems
AVG Average wind conditions for long-term monitoring
Backlight Function

The HP-866B-WM features a built-in backlight for clear reading in dark environments.

How to Use Backlight

Press the backlight button once

LCD screen illuminates for easy reading

Backlight automatically turns off after 15 seconds

Press again to turn on if needed

When to Use Backlight

Night time outdoor measurements

Dark indoor environments

Early morning or late evening readings

Poor lighting conditions

Auto Power Off

The meter automatically powers off after 10 minutes of no operation to save battery life.

Low Battery Indication

Battery icon appears on display when voltage is low

Replace batteries when icon appears

Use 2 x 1.5V AAA batteries

Applications and Suitable For

The HP-866B-WM weather meter is suitable for a wide range of professional and outdoor applications.

Primary Applications

Industry/Scenario Use Case
Sailing & Boating Wind speed and weather monitoring on water
Fishing Wind conditions assessment for fishing trips
Drone Flying Pre-flight wind speed checking
HVAC Systems Air flow and ventilation measurement
Outdoor Sports Camping, hiking, climbing weather monitoring
Industrial Exhaust system and ventilation testing
Scientific Research Environmental data collection
Home Weather Personal weather station supplement
Measurement Capabilities Summary

Feature Measurement
Wind Speed 0.3-30 m/s, 5 units
Temperature -10°C to 45°C
Humidity 5% to 95% RH
Barometric Pressure 10-1100 hPa
Altitude 0-9000m
Wind Chill Calculated
Dew Point Calculated
Suitable For

Sailors and boaters

Drone pilots and UAV operators

HVAC technicians

Outdoor sports enthusiasts

Weather hobbyists

Campers and hikers

Fishermen

Industrial maintenance personnel

Environmental scientists

Key Advantages

5-in-1 measurement in one compact device

8-leaf wind wheel for accurate readings

Dual temperature sensors for precision

Multi-unit display for global use

Lightweight and portable design

Package Contents and Maintenance

Package Includes

Item Quantity
HP-866B-WM Weather Meter 1
1.5V AAA Batteries 2
User Manual 1
Battery Replacement

When low battery icon appears on LCD, replace batteries immediately.

Steps to Replace Battery

Open the battery compartment on the back of the unit

Remove old batteries

Insert two new 1.5V AAA batteries (observe correct polarity)

Close battery compartment securely

Maintenance and Care

Wind Wheel Care

Keep the 8-leaf wind wheel clean and free from debris

Do not touch the wind wheel with sharp objects

If the wind wheel is damaged, accuracy may be affected

General Maintenance

Wipe with a soft, dry cloth

Do not use chemical solvents or abrasive cleaners

Store in a cool, dry place when not in use

Remove batteries if storing for extended periods

Storage

Store in a clean, dry environment

Avoid extreme temperatures and humidity

Keep away from direct sunlight

Protect from vibration and impact

Safety Notes

Do not disassemble the instrument

Do not expose to water or liquids

Do not use near high heat sources

This product is not a toy – keep away from children

Note

The product pictures and contents are for reference only. Please be subject to actual products. Specifications subject to change without notice.