Measurement
Response Time |
Units |
Operational
Range |
Resolution |
Accuracy
(+/-) |
Specification
Range |
Wind
Speed
1 second |
m/s |
0.4
to 60.0 m/s |
0.1 |
Larger
of 3% of reading or least significant digit |
0.4
to 40.0 m/s |
| ft/min |
59
to 11,948 ft/min |
1 |
59
to 7877 ft/min |
| km/h |
1.0
to 218.0 km/h |
0.1 |
1.0
to 144.0 km/h |
| mph |
0.8
to 135.0 mph |
1 |
0.8
to 89.0 mph |
| knots |
0.6
to 118.3 kt |
0.1 |
0.6
to 78.0 kt |
| Beaufort |
0
to 12 B |
0.1 |
0
to 12 B |
| 1
inch diameter impeller with precision axle and sapphire
bearings. Off-axis accuracy -1% @ 5º off-axis;
-2% @ 10º; -3% @ 15º. Calibration drift <
1% after 100 hours use at 16 MPH / 7 m/s. Sustained
operation above 60 MPH / 27 m/s will wear impeller
rapidly and may cause destruction of impeller. Replacement
impeller (NK PN-0801) may be field-installed without
tools (US Patent 5,783,753). |
Temperature
1 second |
°F |
-49.0
to 257.0 °F |
0.1 |
1.8
°F |
-20.0
to 158.0 °F |
| °C |
-45.0
to 125.0 °C |
0.1 |
1.0
°C |
-29.0
to 70.0 °C |
| Measures
air, water and snow temperature. Thermally isolated,
hermetically sealed, precision thermistor mounted
externally (US Patent 5,939,645). Calibration drift
negligible. |
Pressure
1 second
(mb & PSI 4000 model only) |
inHg |
0.3
to 32.5 inHg |
0.01 |
0.05
inHg |
At
77.0 °F, 22.1 to 32.5 inHg |
| hPa
/ mb |
10.0
to 1100.0 hPa / mb |
0.1 |
1.5
hPa / mb |
At
25.0 °C, 750 to 1100 hPa / mb |
| PSI |
0.15
to 16.0 PSI |
0.01 |
0.02
PSI |
At
77.0 °F, 10.9 to 16.0 PSI |
| Monolithic
silicon piezoresistive pressure sensor with second-order
temperature correction. Maximum error over temperature
range 32 to 158 °F (0 to 70°C) , +/- 0.06 inHg / +/-2.0
hPa. Calibration drift typically -0.03 inHg / -1.0
hPa per year. Pressure sensor may be recalibrated
at factory or in field. |
Altitude
1 second |
ft |
-6000
to 30000 ft |
1 |
50
ft |
At
77.0 °F, <19,700 ft. Max error +/- 98 ft |
| m |
-2000
to 9000 m |
1 |
15
m |
At
25.0 °C, <6,000 m. Max error +/- 30 m |
| Temperature
compensated pressure (barometric) altimeter. |
Wind
Chill
1 second |
°F |
0.7
to 135.0 MPH, -49.0 to 257.0 °F |
0.1 |
1.8
°F |
1.8
to 89.0 mph, -50.0 to 50.0 °F |
| °C |
0.4
to 60.0 m/s, -45.0 to 125.0 °C |
0.1 |
1.0
°C |
0.4
to 40 m/s, -45.6 to 10.0 °C |
| Calculated
from the primary measurements of wind speed and temperature.
Utilizes the NWS Wind Chill Temperature (WCT) Index,
revised 2001, with wind speed adjusted by a factor
of 1.5 to yield equivalent results to wind speed measured
at 10 m above ground. (Specification temperature
limits established by WCT Tables.) |
| Max/Avg
Wind Speed |
One-button
clear and restart of Max Wind Gust and Average Wind
measurement. |
| Pressure
Trend |
Continuously
updating three-hour barometric pressure trend indicator:
rising rapidly, rising, steady, falling, falling rapidly. |
| Display |
Reflective
4 digit LCD. Digit height 0.36 in / 9 mm. |
| Display
Update |
1
second. |
| Display
Backlight |
Includes
a optical filter to reduce overall brightness and
minimize blue and green spectrum light to preserve
night vision. The NV backlight appears soft greyish
pink. |
| Clock
/ Calendar |
Real-time
hours:minutes clock. |
Operational
Temperature Range
(LCD and Batteries) |
The
operational temperature range of the liquid crystal
display and batteries is 14° F to 131° F / -10 °C
to 55 °C. Beyond the limits of the operational temperature
range, the unit must be maintained within range and
exposed for minimum time necessary to take reading. |
| Storage
Temperature |
-22
°F to 140 °F / -30 °C to 60 °C. |
| Auto
Shutdown |
After
45 minutes of no key presses. |
| Certifications |
CE
certified. Individually tested to NIST-traceable standards
(written certificate of tests available at additional
charge). |
| Batteries |
CR2032,
one, included. Average life, 300 hours of use, +/-depending
on backlight use. |
| Environmental |
Waterproof
(IP67 standard). Drop-tested (MIL.STD.810F; unit only.
Substantial impact may damage replaceable impeller.). |
| Dimensions |
Unit
4.8 x 1.7 x 0.7 in / 122 x 42 x 18 mm. Case 4.8 x
1.9 x 1.1 in / 122 x 48 x 28 mm. |
| Weight |
Unit
2.3 oz / 65 g. Case 1.3 oz / 37 g. |
| Kestrel
Meters are designed and manufactured at NK’s facility
in Boothwyn, Pennsylvania, and are individually calibrated
at the time of manufacture. Every Kestrel Meter comes
with a Certificate of Conformity to document the unit’s
accuracy—all Kestrel measurements are traceable to
the National Institute of Standards and Technology,
ensuring the highest level of reliability. Additional
NIST Calibration and Certification services are available. |
