Kestrel 5100 Racing Weather Meter - available from Mendip Weather

Available to order, usually 4 to 5 days

Kestrel 5100 Racing Weather Meter

Make those last minute dial-in or turning decisions count with the Kestrel 5100.
Measure weather where it really matters - at the track!

• Measures moisture content (grains), air density, relative air density (RAD), relative humidity, temperature, barometric pressure, wind speed & much more
• Large, hi-res, hi-contrast, graphic display is perfectly readable in the brightest sunlight
• Backlit for night use
• Handheld, portable weather station with onboard data logging & graphing
• Optional LiNK connectivity powered by Bluetooth Smart®
• Provides wireless communication to mobile devices and computers
• Rugged (drop tested to MIL-STD-810G standards)
• Waterproof (sealed to IP67 standards) and floats
• Protective pouch, neck lanyard & Lithium AA battery included
• 5-year warranty

When winning matters, take the Kestrel 5100 for a ride. The Kestrel 5100 is just as accurate, reliable and user-friendly as the original Kestrel 4250. It measures moisture content in grains, air density, relative air density, humidity and other critical factors. Count on it for the information you need to make perfect ET predictions and performance-maximizing tuning and jetting decisions.

The new Kestrel 5 Series platform adds many new features and options. If you're familiar with the Kestrel 4500, the first thing you'll notice is the larger, higher-resolution and contrast display and improved font readability. The Kestrel 5 series also includes a built-in dual color backlight, extra-strong polycarbonate lens and AA battery operation and offers optional LiNK iOS and Android wireless connectivity and app support. Like all Kestrel meters, the Kestrel 5100 is drop-proof, dust-proof, waterproof and able to withstand harsh environments without damage – so it can race as hard as you do, wherever you do. A range of carry pouch options makes it even easier to take your Kestrel meter with you.

The compact, portable design makes this unit easy to take right to the track – exactly where you need to get the most accurate and race-relevant measurements. Pair it with the optional Kestrel Vane Mount for hands-free measurements logged over the course of the day. For maximum functionality, choose a Kestrel 5100 with LiNK to transmit live measurements to the Kestrel LiNK app on your iOS or Android device up to 100' away (line of sight).

In addition to measuring the current environmental conditions, the Kestrel 5100 tracks and logs over 10,000 sets of time-stamped data for comparison to your actual run times later. Your data log can be transferred to a mobile device wirelessly, or to a PC with either the optional Kestrel LiNK Dongle or waterproof USB Data Transfer Cable (available separately).

Kestrels 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 auto pit crews are just a few who rely on a Kestrel 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 in action.

Affordable, accurate, portable and reliable, Kestrel meters have been proven at race tracks everywhere. Put the weather on your side – put a Kestrel in your toolbox.

SensorAccuracy (+/-)ResolutionSpecification RangeNotes
Wind Speed | Air FlowLarger of 3% of reading, least significant digit or 20 ft/min0.1 m/s
1 ft/min
0.1 km/h
0.1 mph
0.1 knots
1 B*
0.1 F/S*
0.6 to 40.0 m/s
118 to 7,874 ft/min
2.2 to 144.0 km/h
1.3 to 89.5 mph
1.2 to 77.8 knots
0 to 12 B*
1 inch|25 mm diameter impeller with precision axle and low-friction Zytel® bearings. Startup 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 startup. 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). Wind speed calibration and testing should be done with triangle on impeller located at the top front face of the Kestrel. Measuring wind speeds above 60 m/s / 134.2 mph can damage the impeller.
*F/S only in Ballistics units. Beaufort not available in Ballistics units.
Ambient Temperature0.9 °F
0.5 °C
0.1 °F
0.1 °C
-20.0 to 158.0 °F
-29.0 to 70.0 °C
Airflow of 2.2 mph|1 m/s or greater provides fastest response and reduction of insolation effect. For greatest accuracy, avoid direct sunlight on the temperature sensor and prolonged sunlight exposure to the unit in low airflow conditions. Calibration drift is negligible for the life of the product. For further details, see Display & Battery Operational Temperature Limits
Relative Humidity±2%RH0.1 %RH10 to 90% 25°C non-condensingTo achieve stated accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and be kept out of direct sunlight. Calibration drift is typically less than ±0.25% per year.
Pressure±1.5 mbar at 25°C, 700-1100 mbar/ ±0.044inHg at 77°F 20.67-32.48 inHg/
±0.022 PSI 10.15-15.95 PS
0.01 inHg
0.1 hPa|mbar
0.01 PSI
700-1100 mbar/20.67-32.48 inHg/10.15-15.95 PSI
Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Between 1100–1200 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1200 mbar and can be damaged above 6,000 mbar or below 10 mbar. Calibration drift is negligible for the life of the product.
1/16th Cardinal Scale
0 to 360°2-axis solid-state magnetoresistive sensor mounted perpendicular to unit plane. Accuracy of sensor dependent upon unit's vertical position. Self-calibration routine eliminates magnetic error from batteries or unit and must be run after every full power-down (battery removal or change). Readout indicates direction to which the back of the unit is pointed when held in a vertical orientation. Declination/variation adjustable for True North readout.


Calculated Measurements

MeasurementAccuracy (+/-)ResolutionSensors Deployed
Air Density0.0002 lb/ft3
0.0033 kg/m3
0.001 lbs/ft3
0.001 kg/m3
Temperature Relative
Humidity Pressure
Air Flow6.71%1 cfm
1 m3/hr
1 m3/m
1 L/s
Air Flow
User Input (Duct Shape & Size)
Altitudetypical: 23.6 ft/7.2 m - 50 to 1100 mBar
max: 48.2 ft/14.7 m – 300 to 750 mBar
1 ft
1 m
User Input (Reference Pressure)
Barometric Pressure0.07 inHg
2.4 hPa|mbar
0.03 PSI
0.01 inHg
0.1 hPa|mbar
0.01 PSI
User Input (Reference Altitude)
Crosswind & Headwind / Tailwind7.1%1 mph
1 ft/min
0.1 km/h
0.1 m/s
0.1 knots
Wind Speed Compass
Delta T3.2 °F
1.8 °C
0.1 °F
0.1 °C
Temperature Relative
Humidity Pressure
Density Altitude226 ft
69 m
1 ft
1 m
Temperature Relative
Humidity Pressure
Dew Point3.4 °F
1.9 °C
15-95% RH. Refer to Range for Temperature Sensor
0.1 °F
0.1 °C
Temperature Relative
Evaporation Rate0.01 lb/ft2/hr
0.06 kg/m2/hr
0.01 b/ft2/hr
0.01 kg/m2/hr
Wind Speed Temperature Relative Humidity Pressure User Input (Concrete Temperature)
Heat Index7.1°F
0.1 °F
0.1 °C
Temperature Relative Humidity
Moisture Content | Humidity Ratio (“Grains”).3gpp
0.1 gpp
0.01 g/kg
Temperature Relative Humidity Pressure
Relative Air Density0.3%0.1%Temperature Relative Humidity Pressure
Wet Bulb Temperature - Psychrometric3.2 °F
1.8 °C
0.1 °F
0.1 °C
Temperature Relative Humidity Pressure
Wind Chill1.6 °F
0.9 °C
0.1 °F
0.1 °C
Wind Speed Temperature


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Display & BacklightMultifunction, multi-digit monochrome dot-matrix display. Choice of white or red LED backlight.
Response Time & Display UpdateDisplay updates every 1 second. After exposure to large environmental changes, all sensors require an equilibration period to reach stated accuracy. Measurements employing RH may require longer periods particularly after prolonged exposure to very high or very low humidity.
Data Storage & Graphical Display, Min/Max/Avg HistoryLogged history stored and displayed for every measured value. Manual and auto data storage. Min/Max/Avg history may be reset independently. Auto-store interval settable from 2 seconds to 12 hours, overwrite on or off. Logs even when display off except for 2 and 5 second intervals. Kestrel 5 series units hold over 10,000 data points.
Data Upload & Bluetooth® Data Connect OptionWireless range up to 100ft. Connection requires optional USB data transfer cable or Kestrel Link Dongle or Kestrel LiNK app. Employs Kestrel Link protocol for data transmission with Link supported devices. (Kestrel LiNK for iOS/Android, Kestrel Link for PC/MAC).
Clock / CalendarReal-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment.
Auto ShutdownUser-selectable – Off, 15-60 minutes with no key presses.
LanguagesEnglish, French, German, Spanish.
CertificationsCE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards.



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Christmas Delivery 2018

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Standard Delivery: 20th December 2018.

Express Delivery: 21st December 2018

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  • Views: 4480
  • Brand: Kestrel
  • Product Code: K5100
  • Availability: Available to order, usually 4 to 5 days
2 Product(s) Sold
  • £282.00
  • Ex Tax: £235.00

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