Ambient Weather WM-4 Handheld Weather Station w/Windspeed, Direction, Temperature, Humidity, Compass, Dew Point, Comfort Index, Psychrometer

Features:
Current wind speed, Maximum wind speed, Average wind speed
Wind measurement units: knots, mph, kph, feet/minute, meters/second, Beaufort
Wind direction in degrees and compass points
Calculates cross wind, head/tail wind
Current temperature (°F or °C)
Current dew point (°F or °C)
Current wet bulb (°F or °C)
Current wind chill (°F or °C)
Current relative humidity (%RH)
Current Delta T
AccuWeather.com® patented Comfort Index™
USA fluxgate compass
Swiss-made impeller
Lifetime calibrated Swiss-made humidity sensor
Backlit LCD display
Auto shutoff after 5-min
Threaded for tripod mounting
Pocket-knife design to protect unit when not in use
Adjustable lanyard
Water resistant and floats
Specifications:
Wind speed range: .8-89 mph
Wind speed accuracy: ±3% when aligned with winds axis
Current wind response time: 1-sec
Avg wind response time: over 10 sec
Max wind response time: 1-sec
Cross wind head/tail wind response time: 5 sec
Wind direction response time: 1 sec
Temperature range: -20° to +158°F
Temperature accuracy: ±1.8°F
Temperature response time: 1 min
Dew point range: -20° to +158°F
Dew point accuracy: ±3.6°F
Dew point response time: 1 min
Wet bulb accuracy: ±3.6°F
Wet bulb range: 32° to 100°F
Wet bulb response time: 1-min
Wind chill range: -50° to +50°F
Wind chill accuracy: ±1.8°F
Wind chill response time: 1 sec
Rel. humidity range: 5-95%
Rel. humidity accuracy: ±3%
Rel. humidity response time: 1 min
Delta T response time: 1-min
Compass accuracy: ±2°
Compass range: 0 to 360
Compass response time: 1 sec
Other Specifications:
Power: CR2032 Lithium battery (included and replaceable)
Dimensions: 5.5″ x 1.75″ x .75″

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The Ambient Weather WM-4 is a comprehensive handheld weather station, directional compass, heat index monitor and psychrometer, all in one compact, portable, rugged package.
The WM-4 measures wind speed, wind direction, temperature, relative humidity and compass direction, and calculates wind gust, dew point, wet bulb and dry bulb temperature, Delta T, wind chill and heat index.
It has a USA-made fluxgate compass for precise digital wind direction measurement, and it can also be used to calculate crosswind & head/tail wind readings with the built in wind vane.
The WM-4 measures wind speed, wind direction, temperature, relative humidity and compass direction, and calculates wind gust, dew point, wet bulb and dry bulb temperature, Delta T, wind chill and heat index.
The jack knife case design protects the unit, and allows you to hold the case while taking precise temperature measurements, avoiding false readings from your hand temperature.