Sensor |
Accuracy (+/-) |
Resolution |
Range |
Wind Speed | Air Flow |
Larger of 3% of reading, least significant digit or 20 ft/min |
0.1 m/s
1 ft/min
0.1 km/h
0.1 mph
0.1 knots
1 B*
0.1 F/S* |
0.6 to 40.0 m/s
118 to 7,874 ft/min
2.2 to 144.0 km/h
1.3 to 89.5 mph
1.2 to 77.8 knots
0 to 12 B*
2-131.2* |
Ambient Temperature |
0.9 °F
0.5 °C |
0.1 °F
0.1 °C |
-20.0 to 158.0 °F
-29.0 to 70.0 °C |
Globe Temperature |
2.5 °F
1.4 °C |
0.1 °F
0.1 °C |
-20.0 to 140.0 °F
-29.0 to 60.0 °C |
Relative Humidity |
±2%RH |
0.1 %RH |
10 to 90% 25°C non-condensing |
Pressure |
±1.5 mbar at 25°C, 700-1100
mbar/ ±0.044inHg at 77°F 20.67-32.48 inHg/
±0.022 PSI 10.15-15.95 PSI |
0.01 inHg
0.1 hPa|mbar
0.01 PSI |
25°C/77°F,
700-1100 mbar/20.67-32.48 inHg/10.15-15.95 PSI |
Compass |
±5° |
1°
1/16th Cardinal Scale |
0 to 360° |
Measurement |
Accuracy (+/-) |
Resolution |
Sensors Employed |
Altitude |
typical: 23.6 ft/7.2 m - 50 to 1100 mBar
max: 48.2 ft/14.7 m – 300 to 750 mBar |
1 ft
1 m |
Pressure User Input (Reference Pressure) |
Barometric Pressure |
0.07 inHg
2.4 hPa|mbar
0.03 PSI |
0.01 inHg
0.1 hPa|mbar
0.01 PSI |
Pressure User Input (Reference Pressure) |
Crosswind & Headwind/Tailwind |
7.1% |
1 mph
1 ft/min
0.1 km/h
0.1 m/s
0.1 knots |
Wind Speed Compass |
Density Altitude |
226 ft
69 m |
1 ft
1 m |
Temperature Relative
Humidity Pressure |
Dew Point |
3.4 °F
1.9 °C
15-95% RH. Refer to Range for Temperature Sensor |
0.1 °F
0.1 °C |
Temperature Relative
Humidity |
Heat Index |
7.1°F
4.0°C |
0.1 °F
0.1 °C |
Temperature Relative
Humidity |
Outdoor Wet Bulb Globe Temperature (WBGT) |
3.2 °F
1.8 °C |
0.1 °F
0.1 °C |
Wind Speed Temperature
Globe Temperature
Relative Humidity
Pressure |
Thermal Work Limit (TWL) |
10.9W/m2 |
0.1 °F
0.1 °C |
Wind Speed Temperature
Globe Temperature
Relative Humidity
Pressure |
Wet Bulb Temperature - Psychrometric |
1.3 °F
0.7 °C |
0.1 °F
0.1 °C |
Temperature Relative
Humidity Pressure |
Wet Bulb Temperature - Naturally Aspirated (NWB TEMP) |
1.4 °F
0.8 °C |
0.1 °F
0.1 °C |
Wind Speed Temperature
Globe Temperature
Relative Humidity
Pressure |
Wind Chill |
1.6 °F
0.9 °C |
0.1 °F
0.1 °C |
Wind Speed Temperature |
Display & Backlight |
Multifunction, multi-digit monochrome dot-matrix display.
Choice of white or red LED backlight. |
Response Time & Display Update |
Display updates every 1 second. After exposure to large environmental changes, all sensors require an equilibration period to reach stated accuracy. Measurements employing RH may require longer periods particularly after prolonged exposure to very high or very low humidity. WBGT requires about 8 minutes to reach 95% accuracy and about 15 minutes to reach 99% accuracy after exposure to large environmental changes. |
Data Storage & Graphical Display, Min/Max/Avg History |
Logged history stored and displayed for every measured value.
Manual and auto data storage. Min/Max/Avg history may be reset independently. Auto-store interval settable from 2 seconds to 12 hours, overwrite on or off. Logs even when display off except for 2 and 5 second intervals. Kestrel 5 series units hold over 10,000 data points. |
Data Upload & Bluetooth ®
Data Connect Option |
Wireless range up to 100ft. Connection requires optional USB data transfer cable or Kestrel Link Dongle or Kestrel LiNK app. Employs Kestrel Link protocol for data transmission with Link supported devices. (Kestrel LiNK for iOS/Android, Kestrel Link for PC/MAC). |
Clock / Calendar |
Real-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment. |
Auto Shutdown |
User-selectable – Off, 15-60 minutes with no key presses. |
Languages |
English, French, German, Spanish. |
Certifications |
CE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards. |
Origin |
Designed and manufactured in the USA from US and imported components. Complies with Regional Value Content and Tariff Code Transformation requirements for NAFTA Preference Criterion B. |
Battery Life |
AA Lithium, included. Up to 400 hours of use, reduced by backlight, alert light and buzzer, or Bluetooth radio transmission use. |
Shock Resistance |
MIL-STD-810g, Transit Shock, Method 516.5 Procedure IV; unit only; impact may damage replaceable impeller. |
Sealing |
Waterproof (IP67 and NEMA-6) |
Display & Battery Operational Temperature Limits |
14° F to 131° F | -10 °C to 55 °C Measurements may be taken beyond the limits of the operational temperature range of the display and batteries by maintaining the unit within the operational range and then exposing it to the more extreme environment for the minimum time necessary to take reading. |
Storage Temperature |
-22.0 °F to 140.0 °F | -30.0 °C to 60.0 °C. |
Size & Weight |
6.5 x 1.9 x 1.1 in / 16.5 x 4.5 x 2.8 cm, 4.8 oz / 136 g. (Lithium battery included) |