2 new from $444.99

Kestrel 4500 Weather & Environmental Meter w/Compass

4.6 out of 5 stars 84 customer reviews
| 11 answered questions

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Desert Tan
With NV Backlight
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  • Handheld portable weather station w/ onboard data logging, digital compass and graphing
  • Senses wind speed, temperature, humidity and pressure and displays up to 16 total measurements on large, clear LCD. Options include case color, Bluetooth® wireless data transfer and standard or red night vision preserving backlight
  • Waterproof (IP-67), floats, drop-tested to military standards (MIL-STD-810G), patented
  • Includes soft pouch, neck lanyard, 2 Energizer° Ultimate Lithium AAA batteries and 5-year warranty
  • Used in firefighting, hazardous materials response, meteorology, military, law enforcement, research, education, scientific expeditions and more
2 new from $444.99

WARNING:
CHOKING HAZARD -- Small parts. Not for children under 3 yrs.

Technical Details


Product Description

Measurements: Heading (true and magnetic), Wind Direction, Crosswind, Headwind/Tailwind, Altitude, Pressure Trend, Barometric Pressure, Relative Humidity, Heat Stress Index, Dewpoint, Wet Bulb Temperature, Density Altitude, Wind Chill, Air, Snow and Water Temperatures, Current and Average Wind Speeds and Maximum Wind Gust, Customizable 2000 Data Point Storage, Data Upload (with optional interface). Equipped with a night-vision preserving backlight. Backlight incorporates optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve night vision. (Note: This backlight appears soft grayish pink, not red, and is still in the visible spectrum, so is not compatible with night-vision equipment.) Model Year: 2011, Product ID: 106885, Model Number: 0845NVOLV, GTIN: 0730650045006

Product Details

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  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B00XJ97LOW
  • Item model number: 0845YEL-P
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (84 customer reviews)
  • Amazon Best Sellers Rank: #307,659 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
  • Product Warranty: For warranty information about this product, please click here

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

By HMMWV VINE VOICE on December 10, 2008
Style Name: Standard ModelColor: Yellow Verified Purchase
Kestrel's patents on a low cost precision istrument have been expanded with the model 4500. Our troops oveseas have come to rely on the accurate data from the kestrel to indicate signs of dehydration, wind, dew point, condensation, all of which it measures with grace.

I bought my first 2 Kestrel 4000 units and I must caution that with excessive use (battery changing) they eventually broke the battery door on both units. I'm subtracting one star from an otherwise perfect product because Kestrel has chosen not to incorporate a green rechargable option yet and still uses AAA alkaline or lithium cells - HOWEVER -

In the earlier models (4000) if you wanted a graph over time you had to leave the unit turned on CONSTANTLY - batteries were dead in 3 days, which wasn't bad for a 2xAAA alkaline system. With the 4500 you leave the unit turned off and give it a wakeup period (say every 30 minutes) when it takes measurements of every weather reading and stores them in memory then powers off right away. My first 2 aaa batteries have been in the unit since I got it and are at 87% full so no more "always on" usage - a big fix.

The case is hermetically sealed to prevent moisture from entering the electronics. The data output is infrared allowing you to download the long term data sets.

Additionally, the 4500 has a compass and optional mounting bracket so you can track wind direction and crosswind.

Kestrel makes 2 versions of the 4500 - Mine is the bright yellow with a neon blue backlight. For military purposes they make an olive drab green case with a subdued red backlight that does not interfere with night vision equipment.

All data (humidity, dewpoint, heat index and a ton more) are graphed based on the time index you specify in setup.
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Style Name: With NV BacklightColor: Desert Tan
The Kestrel 4500/4500NV is a pocket sized weather station weighing in at a mere 102 grams with NIST tracable accuracy, trend recording data for plots of barometric pressure over time (in days) or windspeed (in minutes), and numerous calculations of wind chill, heat index, and many more. Its compass is one of the most accurate electronic compasses I have used (and I use garmin's frequently) with a reading to the nearest degree that is repeatable. Using just 2 AAA batteries and an included brace to prevent them from rattling causing compass errors, it provides 400 hours of active usage or months of weather trend logging.

Basically the older 4000 unit had a few bugs, mostly with the extreme case sealing to make the unit watertight so it could be left outside overnigt or dunked in the water. While you could buy the 4000 in grey or orange and get the same electronics, the olive drab 4500NV is substantially different than the 4500 yellow model. The NV stands for night vision and uses a backlight scheme that is compatible with Gen 3 NV goggles. While both units are identical during the day, at night the 4500NV has a dimly backlit display while the 4500 yellow case has a bright green backlight along the lines of the timex indiglo (TM) design. If you are using night vision goggles, the 4500NV is the proper version, however many people have complained that without NV goggles the backlight is not sufficient on the 4500NV compared to the 4500. Unfortunately the case color and backlight go together and you can not swap either. While the 4500NV is not invisible to the naked eye, it is sure dim compared side by side with the 4500. To sum it up, the 4500NV can be used on a dark night if your eyes have adapted.
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Style Name: With NV BacklightColor: Olive Drab
During the Iraqi and Afghanistan campaigns, soldiers needed to know fairly precise windspeed for artillery and marksmanship purposes. In fact, some rifle scopes today expect the user to own a kestrel wind speed meter and need the data from the meter to compute the scope adustment.

Kestrel worked with the US DOD to make the 4500NV (after all the 4000 was hunter orange) - in fact they worked so hard that the backlight on the 4500NV (NV stands for Night Vision) is so dim that it is not as useful as the standard 4500 (bright yellow case) which has a nightlight like a timex indiglo watch (too much for our Gen 3 NV systems).

The download data function *IS* very slow - the reason is that the case is weather sealed and the data is sent and received using infrared diodes on the back of the case. Back in the days prior to usb, these went to a 2400 - 9600 baud serial line, and they were fine. The USB version of the data adapter maintains the clock rates of the old serial standard to be compatible.

The biggest win for the user is that on the 4000 you had to leave it turned on all the time if you wanted a graph of weather readings every XX minutes to predict the weather. It did a great job graphing, but also drained the battery, and there was no way to tell the 4000 to wake up every 30 minutes, take a reading, and go back to sleep. The 4500 series does this so now you get accurate weather without wasting batteries. In fact, 2 batteries which lasted 3 days on the 4000 can last 3 months on the 4500 due to this one simple improvement.

Other military uses of the Kestrel are the Heat Index function which is used to ensure troops do not become dehydrated and to assess the risk of heat stroke in the summer sands of iraq.
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