:: Product Information

Kestrel® 2500 Pocket Wind Meter

NK

Overview

The Kestrel 2500 takes the great features of the Kestrel 2000 and adds in a pressure sensor. A three-hour pressure trend indicator helps you predict fish and wildlife activity and know when the weather's going to turn nasty. With its easy-to-use digital pressure altimeter, you have the perfect instrument for any outdoor activity.
In addition to predicting weather activity, barometric pressure also influences a bullet’s trajectory, which is why the Kestrel 2500 is used by shooters and hunters when accuracy is important. US Olympic Rifle Champion Shooter Lones Wigger wouldn’t trust any other instrument. “The Kestrel Meter is essential for target rifle shooting. It helps me win matches, and I rely on it for accurate weather information.”

Available in the NV Configuration

Military personnel and pilots flying in darkness are often concerned with preserving their night vision. Due to overwhelming demand from our military customers, the Kestrel NV line was added in 2005.
The Kestrel 2500NV has a night-vision preserving backlight which helps users to sustain natural night vision. The NV's backlight incorporates an optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve night vision. Additionally, NV backlights are also much dimmer than a standard backlight, making it more difficult to detect with the naked eye in night operations. This backlight appears soft greyish pink, not red, and is still in the visible spectrum, so is not compatible with night-vision equipment.
It takes 30 to 45 minutes for the average eye to adapt to darkness and maximize night vision. Even a short burst of white, yellow, green or blue light “bleaches out” the rod cell photoreceptors in the eye and causes night blindness until the entire adaptation process can take place again. Light in the red spectrum does not cause this “bleaching out”, preventing night blindness and night vision fatigue.

Kestrel 2500 Measures

Current Wind Speed
Maximum Wind Gust
Average Wind Speed
Air, Water & Snow Temperature
Wind Chill
Barometric Pressure
Altitude

Kestrel 2500 Features

Real-time clock
Protective cover with sure-grip overmolding
Data hold function
Large easy-to-read display with backlight
Waterproof and floats
Innovative design for stability and accuracy in abrupt condition changes
Patented user-replaceable impeller
Quick response, external thermistor
High precision pressure sensor
Reliable, portable and easy to use
All instruments and accessories are completely assembled in the USA
5-year warranty

Kestrel 2500 Includes

A slip-on protective cover
Neck lanyard
CR2032 coin cell battery (Average life 300 hours)
Kestrel Certificate of Conformity

Specifications:

Measurement
Response Time

Units

Operational Range

Resolution

Accuracy (+/-)

Specification Range

Wind Speed
1 second  

m/s

0.4 to 60.0 m/s

0.1

Larger of 3% of reading or least significant digit

0.4 to 40.0 m/s

ft/min

59 to 11,948 ft/min

1

59 to 7877 ft/min

km/h

1.0 to 218.0 km/h

0.1

1.0 to 144.0 km/h

mph

0.8 to 135.0 mph

1

0.8 to 89.0 mph

knots

0.6 to 118.3 kt

0.1

0.6 to 78.0 kt

Beaufort

0 to 12 B

0.1

0 to 12 B

1 inch diameter impeller with precision axle and sapphire bearings.  Off-axis accuracy -1% @ 5º off-axis; -2% @ 10º; -3% @ 15º.  Calibration drift < 1% after 100 hours use at 16 MPH / 7 m/s. Sustained operation above 60 MPH / 27 m/s will wear impeller rapidly and may cause destruction of impeller. Replacement impeller (NK PN-0801) may be field-installed without tools (US Patent 5,783,753).

Temperature  
1 second

°F

-49.0 to 257.0 °F

0.1

1.8 °F

-20.0 to 158.0 °F

°C

-45.0 to 125.0 °C

0.1

1.0 °C

-29.0 to 70.0 °C

Measures air, water and snow temperature. Thermally isolated, hermetically sealed, precision thermistor mounted externally (US Patent 5,939,645). Calibration drift negligible.

Pressure  
1 second  
(mb & PSI 4000 model only)

inHg

0.3 to 32.5 inHg

0.01

0.05 inHg

At 77.0 °F, 22.1 to 32.5 inHg

hPa / mb

10.0 to 1100.0 hPa / mb

0.1

1.5 hPa / mb

At 25.0 °C, 750 to 1100 hPa / mb

PSI

0.15 to 16.0 PSI

0.01

0.02 PSI

At 77.0 °F, 10.9 to 16.0 PSI

Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Maximum error over temperature range 32 to 158 °F (0 to 70°C) , +/- 0.06 inHg / +/-2.0 hPa. Calibration drift typically -0.03 inHg / -1.0 hPa per year. Pressure sensor may be recalibrated at factory or in field.

Altitude  
1 second  

ft

-6000 to 30000 ft

1

50 ft

At 77.0 °F, <19,700 ft. Max error +/- 98 ft

m

-2000 to 9000 m

1

15 m

At 25.0 °C, <6,000 m.  Max error +/- 30 m

Temperature compensated pressure (barometric) altimeter. 

Wind Chill  
1 second  

°F

0.7 to 135.0 MPH, -49.0 to 257.0 °F

0.1

1.8 °F

1.8 to 89.0 mph, -50.0 to 50.0 °F

°C

0.4 to 60.0 m/s, -45.0 to 125.0 °C

0.1

1.0 °C

0.4 to 40 m/s, -45.6 to 10.0 °C

Calculated from the primary measurements of wind speed and temperature.  Utilizes the NWS Wind Chill Temperature (WCT) Index, revised 2001, with wind speed adjusted by a factor of 1.5 to yield equivalent results to wind speed measured at 10 m above ground.  (Specification temperature limits established by WCT Tables.)

Max/Avg Wind Speed

One-button clear and restart of Max Wind Gust and Average Wind measurement.

Pressure Trend

Continuously updating three-hour barometric pressure trend indicator: rising rapidly, rising, steady, falling, falling rapidly.

Display

Reflective 4 digit LCD.  Digit height 0.36 in / 9 mm.

Display Update

1 second.

Display Backlight

Aviation green electroluminescent backlight.

Clock / Calendar

Real-time hours:minutes clock.

Operational Temperature Range
(LCD and Batteries)

The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Beyond the limits of the operational temperature range, the unit must be maintained within range and exposed for minimum time necessary to take reading.

Storage Temperature

-22 °F to 140 °F / -30 °C to 60 °C.

Auto Shutdown

After 45 minutes of no key presses.

Certifications

CE certified. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge).  

Batteries

CR2032, one, included. Average life, 300 hours of use, +/-depending on backlight use.

Environmental

Waterproof (IP67 standard). Drop-tested (MIL.STD.810F; unit only. Substantial impact may damage replaceable impeller.).

Dimensions

Unit 4.8 x 1.7 x 0.7 in / 122 x 42 x 18 mm. Case 4.8 x 1.9 x 1.1 in / 122 x 48 x 28 mm.

Weight

Unit 2.3 oz / 65 g.  Case 1.3 oz / 37 g.

Kestrel Meters are designed and manufactured at NK’s facility in Boothwyn, Pennsylvania, and are individually calibrated at the time of manufacture. Every Kestrel Meter comes with a Certificate of Conformity to document the unit’s accuracy—all Kestrel measurements are traceable to the National Institute of Standards and Technology, ensuring the highest level of reliability. Additional NIST Calibration and Certification services are available.

Producing Area:USA

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Email: Dianjiang_HK@yahoo.com.hk   Hongkong@Dianjiangtech.com
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