ACCURACY:

Wind speed +/–3%
Temp/Wind-chill +/– 2°F/–1°C
Relative Humidity +/– 3%
Dew Point +/– 3°F (2°C)
Heat Index +/– 4°F (3°C)
Barometric Pressure
+/– 3 hPa (millibars)

RESPONSE TIMES:

Wind speed: Current:
2 sec. avg.; Average:
5 sec. avg.; Max 2 sec. gust
Temp/Wind-chill/Humidity/
Dew Point: 1 min.
Barometer: 15 min sampling updated each minute

RANGES:

Wind speed: .4 – 89 MPH; Temp: +5° to +122° F/–15° to +50°C
Wind-chill: –22° to +158° F/–30° to +70°C
Dew Point: –31.2° to +155.8°F/–35.1° to +68.8°C
Heat Index: +69.8° to +155.8°F/+20.9° to +105°C
Humidity: 0 – 99%; Barometer: 400 –1100 hPa or 11.8 – 32.5 inHg
Altitude: –650 to 9000 meters

OPTIONAL UNITS:

Wind: Knots, Beaufort, MPH, KPH, Ft/Min, M/Sec, Temp: °F or °C; Barometer: inHg or hPa (millibars)

OPERATING TEMP: +5° to +122°F/–15° to +50°C
STORAGE TEMP: –40° to +185°F/–40° to +85°C
POWER: 400-Hr replaceable Lithium battery/CR2032 (included)
MEASURES: 5.875) x 2.1) x .85)/127 x 53 x 21.5mm (closed)
WEIGHS: 4 oz/113.4 grams