Kestrel® 3500DT Pocket Weather® Meter
11
within several minutes. To test this, place your hand around the rear of the unit. Within
several seconds, the humidity will increase dramatically. After removing your hand, the
humidity will quickly begin to decrease. Next, place your hand near the rear of the unit and
wave the unit back and forth. The humidity will not change because the air flow is diluting
the humidity from your hand.
This example shows the importance of keeping air flow past the sensor while taking a
measurement. If there is no natural air flow past the sensor, wave the unit back and forth.
It is also reasonable to lay the unit down on a solid surface for several minutes to allow the
sensor to adjust.
Sensor Calibration
All the sensors have been factory calibrated to be
accurate within specifications. For recalibration,
you may either return it to Nielsen-Kellerman for
factory calibration, or contact NK for field calibration
instructions. Humidity Field Calibration Kits are also
available for sale online.
BEAUFORT SCALE
The Beaufort Scale is a system for estimating
wind force without the use of instruments based
on the visible effects of the wind on the physical
environment. The behavior of smoke, waves, trees, etc., is rated on a 13 point scale. The scale
was devised in 1805 by the British naval Commander Sir Francis Beaufort (1774-1857) and is
still commonly used by mariners.
KESTREL POCKET WEATHER METERS 5-YEAR LIMITED WARRANTY
NK does not believe in “disposable electronics.” We know that Kestrel Meters don’t typically
lead pampered lives, and we design them for years of performance in tough conditions.
Every Kestrel is designed and manufactured at NK’s facility in Boothwyn, Pennsylvania, to be
the accurate, reliable weather instrument you need for your application. If for any reason
you are not satisfied with the performance or operation of your Kestrel meter in the first 30
days, you may return it to your place of purchase for a full refund.
We guarantee every Kestrel Pocket Weather Meter to be free of defects in materials and
workmanship for a period of FIVE YEARS from
their date of first consumer purchase.
NK
will repair or replace any defective product or part when notified within the warranty period,
and will return the product via domestic ground shipping or NK’s choice of method of inter-
national shipping at no charge.
The following shall be excluded from warranty coverage:
damage due to improper use
or neglect (including corrosion); damage caused by severe or excessive impact, crushing or
mechanical harm; modifications or attempted repairs by someone other than an authorized
Force
Description
Kts
0
Calm
0
1
Light Air
1-3
2
Light Breeze
4-6
3
Gentle Breeze
7-10
4
Moderate Breeze
11-16
5
Fresh Breeze
17-21
6
Strong Breeze
22-27
7
Near Gale
28-33
8
Gale
34-40
9
Strong Gale
41-47
10
Storm
48-55
11
Violent Storm
56-63
12+
Hurricane
64+
Shop for Kestrel products online at:
1.877.766.5412
www.
WeatherMeters-Direct
.com
