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

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

  • from Ambient Weather
  • List price: $200.00
  • 2 new from $119.99
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Ambient Weather WM-4 Handheld Weather Station

Dew Point Display on the WM-4.
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Optional Mounting Tripod (not included)
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The WM-4 is a complete weather station in your hand

The Ambient Weather WM-4 is a comprehensive handheld wind meter, directional compass, comfort 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 comfort index.

USA-made Fluxgate Compass

The WM-4 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. Unlike traditional compasses which require leveling, the WM-4 reads when held vertically and can be used to take a bearing on a distant landmark or reference location.

Jack Knife Case Design

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.

Abundant Applications

Applications include backpacking and hiking, biathlon, camping, climbing and mountaineering, athletic trainers, golfing and caddying, hang gliding, kite boarding, kite surfing, model airplanes, paddle sports, sailing and yachting, scuba diving, ski patrol, sky diving, snow making, snow sports, wind surfing, forestry and firefighting, amateur weather watching, meteorology, NOAA weather data collection, storm chasing, skywarn spotters, TV weather reporting, wind power generation, construction, HVAC, shooting sports, motor sports, scientific and educational research. The WM-4 can be tripod-mounted and accessories include a wind tunnel for very accurate directional measurements, replacement impeller, soft belt carrying case, and humidity calibration kits to insure the humidity is within specified range.

Special Notes and Caveats:

The LCD display will not operate below approximately 14 F. Use the warmth of your body or environment for use in cold weather conditions. The temperature sensor is inside the monitor, takes several minutes to stabilize, and is influenced by body heat and direct sunlight.


  • Wind speed range: .8-89 mph
  • Wind speed accuracy: 3% when aligned with winds axis
  • Current wind response time: 1-second
  • Average wind response time: over 10 seconds
  • Maximum wind response time: 1-second
  • Cross wind head/tail wind response time: 5 seconds
  • Wind direction response time: 1 second
  • Temperature range: -20 to +158F
  • Temperature accuracy: 1.8F
  • Temperature response time: 1 minute
  • Dew point range: -20 to +158F
  • Dew point accuracy: 3.6F
  • Dew point response time: 1 minute
  • Wet bulb accuracy: 3.6F
  • Wet bulb range: 32 to 100F
  • Wet bulb response time: 1-minute
  • Wind chill range: -50 to +50F
  • Wind chill accuracy: 1.8F
  • Wind chill response time: 1 second
  • Relative humidity range: 5-95%
  • Relative humidity accuracy: 3%
  • Relative humidity response time: 1 minute
  • Delta T response time: 1-minute
  • Compass accuracy: 2
  • Compass range: 0 to 360
  • Compass response time: 1 second
Ambient Weather: Weather Stations, Emergency Radios and Power Products
Features and Specifications:
  • 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
  • Exclusive patented Comfort Index
  • USA fluxgate compass
  • Use as a bearing compass
  • Replaceable 400 hour lithium battery
  • Swiss-made impeller components
  • Lifetime calibrated Swiss-made humidity sensor
  • Easy to read backlit LCD display
  • Auto shutoff after five (5) minutes
  • Threaded for tripod mounting
  • Unique pocket-knife design to protect unit when not in use
  • Comes with adjustable lanyard
  • Water resistant and floats
  • Two (2) year warranty


  • Power requirement: CR2032 Lithium battery (included)
  • Dimensions: Unit (closed): 5.5" x 1.75" x .75"
  • User Manual included (English)
Compare Ambient Weather Handheld Wind Meters
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Wind Speed
Wind Direction (wind vane)
Barometer / Altimeter
Dew Point
Wind Chill
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