Think the weather conditions at the track are the same as the information you are getting at the trailer? Think again.

Even slight fluctuations in weather conditions like temperature, humidity, barometric pressure and density altitude can affect your car's performance. Kestrel Weather Meters provide quick, accurate information to help you decide what changes need to be made, before even making a lap around the track or a pass down the drag strip. Portable and easy-to-use, Kestrels give racers and pit crews relevant data to gain that competitive edge at a fraction of the cost of other systems currently on the market.

In pits around the country, racers have been trading in their bulky and expensive weather monitoring stations in favor of the portable Kestrel 5100 Racing Weather Tracker.

The Kestrel 5100 Racing Weather Tracker is the next generation of weather monitoring. It measures every environmental condition with unrivaled ease and accuracy — and all in a cell-phone sized package. Temperature, humidity, barometric pressure, and density altitude are all continuously measured, and data is stored either manually or automatically. A 1600-point data log lets you keep track of the conditions for each race day, and the optional computer interface lets you upload all the data to your PC or laptop — making long-term storage, in-depth analysis, and detailed charting of stored data a breeze.

The Kestrel 5100 features the best portable sensors available, assuring that it's dead-on accurate. Each unit is individually calibrated before it leaves our manufacturing plant, and comes with a certificate of conformity. We even hold four patents on the technology our engineers have developed especially for the Kestrel line.

Did we mention that it's durable, too? Kestrels are built tough right here in the USA, and carry a five-year warranty. Each Kestrel is fully waterproof and can handle being tossed into your tool box. They're the only hand-held weather instruments trusted by the US Military.

Increase your performance when it counts the most. Let a Kestrel Racing Weather Tracker help you with those last minute tuning decisions.

Here's what our customers had to say!

"The Kestrel is the perfect tool for making those last minute dial-in decisions in the staging lanes. The cell phone sized meter gives me fast, reliable data just seconds before my pass."
- Bill Barr, Quaker City Raceway, Modified Class

"The unit itself is one of the most valuable tools in our trailer. It allows us to win races and rounds."
- Tom Martino, Martino Motorsports Youngstown, Ohio

"The Kestrel comes in handy when we go to the staging lanes, and are delayed for some time, we can track the weather changes."
- Dan Parker, Parkertech Racing, VIP Sports Dodge Stratus, TAFC 33

"Overall I'd say this is a trick little piece. All the readings were so close to matching up (with high priced weather station), I could have easily made the right tune-up decisions based on the Kestrel. We wondered why we were paying so much for our weather station (about $3,000)."
- Jim Oberhofer, Crew Chief , Doug Kalitta's NHRA Top Fuel Dragster

"The auto store feature is key because once you get into later rounds, you don't have time to "log" all that data in your book. All I do is hit the auto store button before each round and fill in my log book whenever time permits."
- Bill Barr, Quaker City Raceway, Modified Class

"It's what I use. I like to take readings but don't need a computer predicting my ETs for me. It's very portable and consistent at a fraction of the cost of the $2,000 plus trailer systems."
- John Rollins, NHRA #2241 (ET, Stock, Super Street)

"I've found my Kestrel to be very helpful in winning 4 class championships and 2 overall track championships at National Trail Raceway since 2004. It was also instrumental in helping me win the NHRA Division 3 Sportsman championship in 2004."
- Ray Block, Block Party Racing

"I finished #1 for my track in the Summit Super Series and can definitely say that my Kestrel was a big part of my consistency. The other racers saw that I was doing well using my Kestrel and asked many questions. The biggest one was what the weather was doing, especially the density altitude. Of course I had to start limiting the information and encouraged them to invest in their own meter. They started watching to see what I did with my dial-in numbers and then change theirs! Very sneaky, but good fun!"
- George Jorgensen, Alaska Raceway Park (Super ET, Summit Super Series Champ)

View the Kestrel 5100
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Why is it important to know the weather conditions, and how can the Kestrel 5100 help me win races?
Weather affects your performance. Period. If you are not using something to measure the weather conditions then you are missing a piece of valuable information that can help you win races. Environmental conditions such as relative humidity, density altitude, dewpoint and wind speed all influence your car. By monitoring these conditions and analyzing how weather patterns from previous races change your car's performance, you are able to make more informed dial-in and tuning decisions. Since the Kestrel 5100 Pocket Weather Tracker is portable and accurate, it enables you to monitor the weather conditions that concern you right at the track, not at the trailer miles away.

I've seen a lot of high dollar weather units on the market, yours is so inexpensive, can it really be accurate?
The engineers at NK have been working on the Kestrel's functionality for over ten years, and have been awarded four patents on their innovative engineering. Additionally, each and every Kestrel is calibrated against NIST-traceable standards, and can be recalibrated in the field or factory. We're so sure of Kestrel Meter's functionality that we guarantee each Kestrel for 5 years, and each one comes with a Certificate of Conformity. Visit for detailed specifications.

How can I be sure the Kestrel 5100 is giving me the altitude and barometric pressure readings that I'm looking for?
The Kestrel 5100 uses the same barometric pressure sensor used in most common barometers and altimeters. These sensors are influenced by the surrounding environment (the altitude), as well as the weather (barometric pressure). These two readings are inter-dependent, and you need to know one of them in order to measure them correctly.

The easiest thing to do is to determine the altitude of the track where you are racing. Google Earth is free software that pinpoints the altitude of any address. Simply enter this value into the barometric pressure screen as the "reference altitude". Then take the barometric pressure reading that the Kestrel displays and enter that as the "reference pressure" on the altitude screen. Now you're good to go!

How does the Kestrel 5500's crosswind calculator work?
The 4500 features a built-in digital compass that allows you to measure the wind speed and direction. In order to display the crosswind, simply point the Kestrel down the runway or target and set the reference heading. Then hold the 4500 into the wind and it automatically calculates the crosswind with respect to the reference heading. It also calculates the headwind/tailwind the same way (headwinds are positive values and tailwinds are negative).

What's so great about the Kestrel impeller?
The Kestrel impeller measures 1 inch across, and turns on a Swiss precision pivot mounted on low friction Zytel® bearings. Its large size ensures accurate readings even if pointed off-angle from the wind, and its very low start-up speed allows measurement of the lightest puffs of wind. If damaged, a new calibrated impeller can be purchased for $19 and popped in without tools, restoring like-new performance.

Can the Kestrel 5000 Series connect with smartphones?
Yes! The Kestrel 5 Series now has both Android and iPhone integration through our Kestrel LiNK iOS and Android Apps. Kestrel LiNK iOS and Android apps allow LiNK enabled Kestrel 5 Series Meters and DROPs to connect wirelessly with mobile devices to view real-time measurements, receive on-screen alerts, download data and perform firmware updates.

What's that curly looking thing?
That's the patented Kestrel temperature sensor. Unlike most watches and other products with temperature measurement, the Kestrel sensor is outside the case to ensure it measures the air, not your hand or pocket. The "curls" serve to further isolate the temperature sensor from the effects of the case temperature.

How does the Kestrel measure humidity so accurately?
The Kestrel features a patented dual temperature sensor configuration for rapid response and accurate measurement. Every Kestrel is calibrated against NIST-traceable standards, and can be recalibrated in the field with the Kestrel RH kit.

How does the Kestrel measure altitude?
The Kestrel uses an atmospheric pressure sensor and calculates altitude based on a standard atmosphere. This is just like the altimeter in an airplane, or an altimeter watch. It's more accurate than a GPS altimeter, but does require periodic reset of the reference pressure to eliminate weather effects.

How does the altimeter work? Is the reference pressure the same as an altimeter setting?
The Kestrel models with altimeter calculate altitude from barometric pressure in exactly the same manner and according to the same rules as an aircraft altimeter. The "reference pressure" on the Altitude screen is the same as the altimeter setting obtained from a local airfield.

Can the Kestrel provide location?
Currently we do not offer a Kestrel with GPS. We may add basic GPS location to a future Kestrel model, but we'll leave the full-blown mapping and navigation to the companies that specialize in GPS as much as we specialize in weather.

Do you really mean MADE in the USA?
Yes. The entire Kestrel line is designed and built in the USA. Some electronic components have to be sourced overseas these days, but we buy American wherever we can.

Who do I call if I have a problem?
You call us! From our Customer Service Representatives to the President of the company, we all answer the phone and know these products inside and out. If you have a problem, we'll fix it. Kestrels hardly ever break, but if they do, they're covered by a 5-year warranty.

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