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Kestrel 4250 Waterproof Pocket Racing Weather Tracker / Wind Meter (Anemometer)
PN# 08425We are an Authorized NK Kestrel Dealer!
Our price for this product is the lowest NK allows it's dealers to sell it for. Anyone claiming to be a dealer who advertises this item or accepts best offers lower than our price is most likely not a Kestrel dealer.
Made in the USA!
The First Step to Optimizing Performance — Knowing the current environmental conditions can often be the difference between finishing in the money and just finishing.
Even slight changes in air density, water grains, and density altitude can dramatically affect a machine’s performance. With the added ability to easily measure and track these and other critical factors, such as absolute pressure, temperature, humidity, wind speed and barometric pressure, the Kestrel 4250 Racing Weather Tracker arms racers with the accurate weather data needed to make those last minute jetting or tuning decisions.
Conditions on the track can often vary greatly from those in the pits. The rugged, portable and easy to use Kestrel 4250 Racing Weather Tracker quickly provides racers and pit crews with the most accurate and up-to-date data available where you need it most — at the track. It allows tuners to determine what last minute changes need to be made based on the current local conditions, even immediately before the first lap around the track or pass down the drag strip — giving you that competitive edge at a fraction of the cost of other systems on the market.
The Kestrel 4250 Racing Weather Tracker also features an automatic and manual data storage function, allowing you to easily keep logs of race day conditions from track to track, year to year. The Kestrel PC Interface and Communicator Software allows data to be easily transferred directly to a PC or laptop making long-term storage, in-depth analysis, and detailed charting of stored data a breeze.
Certified and Guaranteed Accuracy
Every single Kestrel manufactured at Nielsen-Kellerman is calibrated for every single value, either directly against NIST-traceable standards or against an intermediary standard that is calibrated daily. Every unit is shipped with a FREE Certificate of Conformity that states what calibrations were performed, and the certified performance specifications.
What does that mean for the customer?
They can be absolutely sure that their weather readings are accurate to the stated specifications. Some competing weather instruments claim the same specifications as Kestrel, but only Kestrel certifies their accuracy. What does that mean for the customer? They can be absolutely sure that their weather readings are accurate to the stated specifications. Some competing weather instruments claim the same specifications as Kestrel, but only Kestrel certifies their accuracy.
Kestrel 4250 Measures
- Density altitude
- Water grains / moisture content
- Air density
- Relative air density
- Wind speed
- Temperature in °F or °C
Kestrel 4250 Includes
- Soft carry pouch
- Neck lanyard
- Batteries - 2 AAA
- Kestrel Certificate of Conformity
Kestrel 4250 Features
- Waterproof and floats
- Backlight for low light conditions
- Data logger (automatic and manual)
- Customizable data storage – 2000 data points
- Multi-Function 3-line display
- Convenient averaging mode
- Data charting
- Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
- User-replaceable impeller
- Flip-top impeller cover
- Upload to a computer (with optional interface)
- Five languages (English, French, Spanish, German, and Italian)
- US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
- 5-year warranty
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 ra 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. Relative Humidity
1 minute %RH 0.0 to 100.0 % 0.1 3.0 %RH 5.0 to 95.0 % non-condensing Polymer capacitive humidity sensor mounted in thin-walled chamber external to case for rapid, accurate response (US Patent 6,257,074). (To achieve stated relative humidity accuracy, unit must be permitted to equilibrate to external temperature when expos Pressure
1 second 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 1100hPa / 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 to158 °F (0 to70°C) , +/- 0.06 inHg / +/-2.0 hPa. Calibration drift typically -0.03 inHg / -1.0 hPa per year. Pressure sen 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 Heat Index
1 minute °F 0.0 to 100.0 %RH, -49.0 to 257.0 °F 0.1 3.6 °F 70.0 to 130.0 °F, 0 to 100% RH °C 0.0 to 100.0 %RH, -45.0 to 125.0 °C 0.1 2.0 °C 21.1 to 54.4 °C, 0 to 100 %RH Calculated from the primary measurements of temperature and relative humidity. Utilizes the NWS Heat Index (HI) tables. (Specification temperature limits established by HI tables.) Dewpoint
1 minute °F 0.0 to 100.0 %RH, -49.0 to 257.0 °F 0.1 3.6 °F -20.0 to 158.0 °F, 20.0 to 95.0% RH °C 0.0 to 100.0 %RH, -45.0 to 125.0 °C 0.1 2.0 °C -29.0 to 70.0 °C, 20.0 to 95.0 %RH Calculated from the primary measurements of temperature and relative humidity. Temperature to which the air would need to be cooled at a constant pressure to become saturated. Wet Bulb Temperature
1 minute °F -49.0 to 257.0 °F, 0.0 to 100.0 %RH, 8.86 to 32.48 inHg 0.1 3.6 °F 32.0 to 100.0 °F, 5.0 to 95.0% RH, 8.86 to 32.48 inHg, <19700 ft °C -45.0 to 125.0 °C, 0.0 to 100.0 %RH, 300.0 to 1100.0 hPa 0.1 2.0 °C 0.0 to 37.8 °C, 5.0 to 95.0 %RH, -2000.0 to 9000.0 hPa, <6000 m Calculated from the primary measurements of temperature, relative humidity and pressure. Temperature indicated by a wet bulb psychrometer. Density Altitude
1 second ft -49.0 to 257.0 °F, 0.0 to 100.0 % RH, 8.86 to 32.48 inHg 1 246 32.0 to 100.0 °F, 5.0 to 95.0 %RH, 8.86 to 32.48 inHg, <19700 ft m -45.0 to 125.0 °C, 0.0 to 100.0 %RH, 300.0 to 1100.0 hPa 1 75 0.0 - 37.8 °C, 5.0 to 95.0 %RH, -2000 to 9000 hPa, <6000 m Calculated from the primary measurements of temperature, relative humidity and pressure. Air density converted to equivalent sea level elevation at the International Standard Atmosphere. Air Density
1 minute lb/ft3 -49.0 to 257.0 °F, 0.0 to 100.0 % RH, 8.86 to 32.48 inHg 0.001 '+/-2% 32.0 to 158.0 °F, 5.0 to 95.0 % RH, 22.10 - 32.48 inHg kg/m3 -45.0 to 125.0 °C, 0.0 to 100.0 %RH, 300.0 to 1100.0 hPa 0.001 '+/-2% 0.0 - 70.0 C, 5-95%, 750-1100hPA Calculated from the primary measurements of temperature, relative humidity and pressure. Relative Air Density
1 minute % -49.0 to 257.0 °F, 0.0 to 100.0 % RH, 8.86 to 32.48 inHg 0.1 +/-2% 32.0 to 158.0 °F, 5.0 to 95.0 % RH,
22.10 - 32.48 inHg Calculated from the primary measurements of temperature, relative humidity and pressure. Moisture Content (Water Grains)
1 minute gpp 0.000 to 5000.0 gpp 0.1 typical accuracy 10% -20 to 130°F, 5 to 95% RH, 8.86 to 32.48 inHg g/kg 0.00 to 720.0 g/kg 0.01 typical accuracy 10% -29 to 54°C, 5 to 95% RH, 300.0 to 1100.0 hPa Calculated from the primary measurements of temperature, relative humidity and pressure. The measure of Grains/lb of dry air, called the humidity ratio, is an indication of the mass of water vapor in air. Max/Avg Wind Speed,
Crosswind, Headwind/Tailwind One-button clear and restart of Max Wind Gust and Average Wind measurement. Data Storage / Display Minimum, maximum, average and logged history stored and displayed for every measured value. 2000-point data logger with graphical display. Auto data storage; interval settable from 2 seconds to 12 hours. Manual data capture. Data Upload Requires optional PC interface (NK PN-0830) and provided software. RS-232 connection with USB adapter available. Display Multifunction, multi-digit programmable dot-matrix display. Display Update 1 second. Display Backlight Choice of aviation green or visible red electroluminescent backlight. Automatic or manual activation. Clock / Calendar Real-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment. 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 Storage Temperature -22 °F to 140 °F / -30 °C to 60 °C. Auto Shutdown User-selectable: 15 or 60 minutes with no key presses or disabled. Languages English, French, German, Italian, Spanish. Certifications CE certified. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge). Batteries AAA Alkaline, two, included. Average life, 400 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 5.0 x 1.8 x 1.1 in / 12.7 x 4.5 x 2.8 cm. Weight Unit 3.6 oz / 102 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.
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International Buyers – Please Note:
Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility.
Please check with your country's customs office to determine what these additional costs will be prior to offerding or buying.
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Warranty and Returns:
If you find the product to be not as described in the listing or not operational, contact us at your earliest convience. If we cannot resolve the matter, We will issue a return merchandise authorization number (RMA). If item is returned, return it at your cost within fourteen (14) days in original, undamaged box and packing. Pending inspection, your money will be fully refunded less all shipping and handling charges or exchanged for another unit. Return shipping charges are the responsibility of the customer.
After (14) Days:Manufacturer Warranty:
Nielsen-Kellerman (Kestrel Meters) Plain Language Warranty Here.
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