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Retail Price: $579.00 inc GST
Postage: Click Here
Warranty: 5 Years
Stock No: k4000
Availability: 3 to 7 days
Product Enquiry: Click Here
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In 2000, we introduced the Kestrel 4000 Pocket Weather Tracker, and today it is still the most comprehensive pocket weather meter on the market. For just under 4 ounces, you get every environmental reading with the press of a single button. The 4000 is unparalleled in its ease of use and totally customizable navigation and data display. In addition to measuring the current conditions, it tracks and stores up to 2000 sets of data, and data can be uploaded to a PC with the optional Kestrel Interface.
Durable? You bet. The 4000 has been subjected to impact, water submersion and extreme temperature tests, and keeps on working. Kestrel 4000's have been put to the test in some of the harshest conditions on the planet. U.S. Special Forces combat weather teams, wildland firefighters, smoke jumpers, Mt. Everest expeditions and IRL pit crews are just a few who rely on a Kestrel 4000 to provide them with the crucial environmental data they need. Watch the Weather Channel during a hurricane, and you're sure to spot a Kestrel 4000 being wielded by an intrepid on-screen meteorologist.
Due to popular demand in a range of applications, the Kestrel 4000 is available in Gray, Olive Drab, and Safety Orange.
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 4000NV is available with an Olive Drab case or a Desert Tan case. The unit 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 4000 Measures
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Barometric pressure
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Pressure trend
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Altitude
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Relative humidity
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Heat stress index
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Dewpoint
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Wet bulb temperature
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Density altitude
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Wind chil
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Air, water, and snow temperature
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Current wind speed
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Average wind speed
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Maximum wind gust
Kestrel 4000 Features
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Waterproof and floats
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Easy to read, backlit display
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Time and date
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Exterior temperature, humidity, and pressure sensors for fast and accurate readings
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Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
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Minimum, maximum, and average values
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Automatically store measurements, even when the unit is turned off
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Manually store measurements with the press of a button
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Customizable data storage - 2000 data points
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Graph and recall trends
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Customize screens to display user-selected measurements
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Data charting
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Data upload (with optional interface)
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Five languages (English, French, Spanish, German, and Italian)
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User-replaceable impeller
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Flip-top impeller cover allows use of other functions while protecting the impeller
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US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
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All instruments and accessories are completely assembled in the USA
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5-year warranty
Kestrel 4000 Includes
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Soft carry pouch
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Neck lanyard
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Batteries - 2 AAA
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Kestrel Certificate of Conformity
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 |
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ft/min |
59 to 11,948 ft/min |
1 |
59 to 7877 ft/min |
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km/h |
1.0 to 218.0 km/h |
0.1 |
1.0 to 144.0 km/h |
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mph |
0.8 to 135.0 mph |
1 |
0.8 to 89.0 mph |
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knots |
0.6 to 118.3 kt |
0.1 |
0.6 to 78.0 kt |
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Beaufort |
0 to 12 B |
0.1 |
0 to 12 B |
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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 |
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°C |
-45.0 to 125.0 °C |
0.1 |
1.0 °C |
-29.0 to 70.0 °C |
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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 |
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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 exposed to large, rapid temperature changes and must be kept out of direct sunlight.) Calibration drift +/- 2% over 24 months. Relative humidity may be recalibrated at factory or in field using Kestrel Humidity Calibration Kit (NK PN-0802). |
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 |
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hPa / mb |
10.0 to 1100.0 hPa / mb |
0.1 |
1.5 hPa / mb |
At 25.0 °C, 750 to 1100 hPa / mb |
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PSI |
0.15 to 16.0 PSI |
0.01 |
0.02 PSI |
At 77.0 °F, 10.9 to 16.0 PSI |
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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 |
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m |
-2000 to 9000 m |
1 |
15 m |
At 25.0 °C, <6,000 m. Max error +/- 30 m |
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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 |
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°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 |
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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.) |
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 |
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°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 |
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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 |
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°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 |
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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. |
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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 |
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°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 |
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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 |
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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 |
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Calculated from the primary measurements of temperature, relative humidity and pressure. Air density converted to equivalent sea level elevation at the International Standard Atmosphere. |
Max/Avg Wind Speed (Air Velocity),
Crosswind, Headwind/Tailwind |
One-button clear and restart of Max Wind Gust and Average Wind measurement. |
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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. |
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Data Upload |
Requires optional PC interface (NK PN-0830) and provided software. RS-232 connection with USB adapter available. |
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Display |
Multifunction, multi-digit programmable dot-matrix display. |
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Display Update |
1 second. |
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Display Backlight |
Choice of aviation green or visible red electroluminescent backlight. Automatic or manual activation. |
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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 take reading. |
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Storage Temperature |
-22 °F to 140 °F / -30 °C to 60 °C. |
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Auto Shutdown |
User-selectable: 15 or 60 minutes with no key presses or disabled. |
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Languages |
English, French, German, Italian, Spanish. |
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Certifications |
CE certified. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge). |
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Batteries |
AAA Alkaline, two, included. Average life, 400 hours of use, +/-depending on backlight use. |
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Environmental |
Waterproof (IP67 standard). Drop-tested (MIL.STD.810F; unit only. Substantial impact may damage replaceable impeller.). |
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Dimensions |
Unit 5.0 x 1.8 x 1.1 in / 12.7 x 4.5 x 2.8 cm. |
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Weight |
Unit 3.6 oz / 102 g. |

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