Product code: K2500 - 0825
• Added functionality of altitude & barometric pressure
• Popular with outdoor enthusiasts
• Particularly mountaineers, hill walkers, skiers & snowboarders
• Entry level Kestrel for target rifle shooters
A trend arrow displays whether the barometric pressure is rising, stable or falling. This trend is calculated over a 3-hour period. The pressure is monitored even when the Kestrel 2500 is switched off. Observing the barometric pressure trend enables prediction of future weather conditions.
The Kestrel 2500 also displays altitude in an easy-to-read digital format - making it the ideal instrument for walking, climbing and other outdoor activities.
The Kestrel 2500 Weather Meter provides high quality, performance and functionality. It has three buttons below the display, making operation simple and allowing the user to view data in current, maximum and average wind speed displays, temperature, barometric pressure, altitude and wind chill displays and also the data hold function.
Wind chill is an equivalent temperature that indicates to the user how their environment really feels. Wind chill is the combination of wind speed and temperature.
The Kestrel 2500 is a small, electronic rotating vane type anemometer (wind meter) with built-in temperature and pressure sensors. It uses high precision Zytel® bearings and a lightweight impeller to provide accurate air flow measurements even at low speeds. The impeller assembly is replaceable by the user in the case of damage.
In order to quickly determine a steady temperature reading, the precision thermistor temperature sensor is mounted externally. A monolithic silicon based pressure sensor enables barometric pressure and altitude to be calculated, with a resolution of 0.1hPa and 1m respectively.
The liquid crystal display has large 9mm high digits and is backlit for a clear readout in low light conditions. Power is from an easily replaceable standard lithium coin cell battery, which will typically give up to 300 hours of operation. The instrument automatically switches off if no keys are pressed for 45 minutes.
For those with after dark requirements, the Kestrel 2500NV (with an olive drab case) is available with a low intensity red backlight to preserve night vision.
The Kestrel 2500 Weather Meter is made from high impact injection moulded plastic and corrosion resistant materials with the electronics fully sealed. It will float if accidentally dropped into water. There is a hard cover for protection when not in use and a lanyard for added security.
|Primary Measurement||Units||Resolution||Accuracy (+/-)||Range:
or Air Velocity
|m/s||0.1||Larger of 3% of reading, least significant digit or 20 ft/min||0.6 to 60.0 m/s
0.6 to 40.0 m/s
|1 inch diameter impeller with precision axle and low-friction Zytel® bearings. Start-up speed stated as lower limit, readings may be taken down to 0.4 m/s | 79 ft/min | 1.5 km/h | .9 mph | .8 kt after impeller start-up. Off-axis accuracy -1% @ 5° off-axis; -2% @ 10° -3% @ 15°. Calibration drift < 1% after 100 hours use at 16 MPH | 7 m/s. Replacement impeller (NK PN-0801) field installs without tools (US Patent 5,783,753).|
|ft/min||1||18 to 11,811 ft/min
118 to 7,874 ft/min
|km/h||0.1||2.2 to 216.0 km/h
2.2 to 144.0 km/h
|mph||0.1||1.3 to 134.2 mph
1.3 to 89.5 mph
|knots||0.1||1.2 to 116.6 knots
1.2 to 77.8 knots
|Beaufort||1||0 to 12 B|
|Temperature||°F||0.1||1.8 °F||-49.0 to 257.0
-20.0 to 158.0
|Air, water or snow temperature. Hermetically-sealed, precision thermistor mounted externally and thermally isolated (US Patent 5,939,645) for rapid response. Airflow of 2.2 mph | 1 m/s or greater provides fastest response and reduction of insulation effect. Calibration drift negligible.|
|°C||0.1||1.0 °C||-45.0 to 125.0
-29.0 to 70.0
|Pressure||inHg||0.01||typical 0.04 inHg
max 0.07 inHg
|0.30 to 32.48 inHg||Air pressure at the location. Adjustable reference altitude allows display of station pressure or barometric pressure corrected to MSL. Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Pressure sensor may be recalibrated at factory or in field. Kestrel 2500 and 3500 display continuously updating three-hour barometric pressure trend indicator: rising rapidly, rising, steady, falling, falling rapidly. Kestrel 4000 series displays pressure trend through graphing function.|
|hPa (mb)||0.1||typical 1.5 hPa
max 2.5 hPa
|300.0 to 1100.0 hPa 10.0 to 1100.0 hPa|
|Wind Chill||°F||0.1||1.8 °F||Refer to stated ranges for wind speed and temp.||Perceived temperature resulting from combined effect of wind speed and temperature. Calculated based on 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.|
|Altitude||ft||1||typical 50 ft
max 98 ft
|-2,300 to 85,000 ft||Height above Mean Sea Level ("MSL"). Temperature compensated pressure (barometric) altimeter requires accurate reference barometric pressure to produce maximum absolute accuracy.|
|m||1||typical 15 m
max 30 m
|-700 to 25,900 m|
|Max/Avg Wind||One-button clear and restart of Max Wind Gust and Average Wind measurement by powering down and restarting unit.|
|Display & Backlight||Reflective 5 digit LCD. Digit height 0.36 in / 9 mm. Choice of aviation green or visible red (NV models only) electroluminescent backlight. Manual activation with auto-off.|
|Response Time & Display Update||All measurements except those based on relative humidity respond accurately within 1 second. Relative humidity and all measurements which include RH in their calculation may require as long as 1 minute to fully equilibrate to a large change in the measurement environment. Display updates every 1 second.|
|Clock / Calendar||Real-time hours:minutes clock.|
|Operational & Storage Temperature Range||The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Measurements beyond the operational range can be taken by briefly exposing unit to extreme conditions such that the display and batteries remain within the operational range. Storage range -22 °F to 140 °F / -30 °C to 60 °C.|
|Auto Shutdown||After 45 minutes of no key presses.|
|Certifications||CE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge).|
|Battery||CR2032, one, included. Average life, 300 hours. Battery life reduced by backlight use in 2000 to 3500 models.|
|Environmental||Waterproof (IP67 and NEMA-6). MIL-STD-810F, Transit Shock, Method 516.5 Procedure IV; unit only; impact may damage replaceable impeller.|
|Size & Weight||4.8 x 1.9 x 1.1 in / 12.2 x 4.8 x 2.8 cm, 3.6 oz / 102 g (including slip-on cover).|
|Colour Options||Gold | Olive drab (NV version)|
The manufacturer reserves the right to amend the specification and therefore the information in this document may be subject to change.
|Kestrel 2500 Data Sheet|
|User Instruction Manual|
|Kestrel 2500 Instructions, English|
|Kestrel 2500 Instructions, French|
|Kestrel 2500 Instructions, German|
|Kestrel 2500 Instructions, Italian|
|Kestrel 2500 Instructions, Portuguese|
|Kestrel 2500 Instructions, Spanish|
|Certificates of Conformity|
|Sample Certificate of Conformity|
|CE Marking - EC Declaration of Conformity|
|Kestrel Product Catalogue|
|Kestrel Pocket Weather Meters Product Catalogue 2012|
Our following Case Studies give an overview of how this product applies to different sectors.
Please click on the title below to read the full case study.
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