**Discontinued as of December 1, 2015. The newly released Kestrel 5000 essentially replaces the 4000. It has the same and some added functions along with some physical and connectivity improvements, like iOS capability.
With many Kestrel 4000's on the market and aftermarket, we're leaving this page up to see what the 4000 was all about historically for reference.
Here is a VIDEO showing the 4000 vs the new 5000 series
As for weather reading features, they will be the same. You won't get a 'better' temperature reading, wind reading, etc, or even more readings than available on the 4000... still the same quality USA made meter backed by a 5 year warranty. Here is what changed:
The Kestrel 4000 Pocket Weather Meter was the baseline wind and weather meter in the Kestrel 4000 series. What set the 4000 and now 5000 series apart from the rest of the Kestrel family is that these high tech weather meters have the capability to store up to 2000 points of weather data, enabling you to track changes in the environment over time. The 5000 series will log roughly 10,000 data points.
The Kestrel 4000 had all the wind and weather monitoring functions available with the Kestrel 3500 Wind Meter, plus the distinct advantage of data storage, graphing functions, and computer interface technology. With these additional options you will be able to record changes in the weather over time, view these changes as graphs on your Kestrel 4000's display, and even upload the data to your PC with the Kestrel Interface. The Kestrel 4000 series had Bluetooth, but was NOT compatible with IOS, and had a range of up to 30-feet.
For military professionals, the Olive Drab NV version of the Kestrel 4000 features 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 greyish pink, not "red", and is still in the visible spectrum, so is not compatible with night-vision equipment.)
Included with the Kestrel Meter 4000 was: Soft Carry Pouch, Wrist & Neck Lanyard, 5 Year Warranty, 2 AAA Batteries, Kestrel Certificate of Conformity
*We shipped every Kestrel 4000 Series Meter exclusively with Made in the USA Energizer® Brand Ultimate Lithium AAA batteries for improved reliability, capacity, cold-weather performance and weight. We strongly recommend that you use only Energizer Ultimate Lithium batteries in your Kestrel Meter. If you choose to install alkaline batteries, we recommend that you do NOT store your Kestrel with these batteries installed, and that you check your batteries for leakage and corrosion a minimum of every 30 days. Damage due to leaking alkaline batteries is not covered under warranty.