The WM-300 is a comprehensive instrument for agriculture, forestry, emergency management and other industry professionals. The Swiss-made humidity sensor is lifetime calibrated! In addition to relative humidity, the unit measures dew point, wet bulb, Delta T, temperature & wind chill. Like the WM-200, it uses a wind vane & a USA-made fluxgate compass for digital wind direction, which also calculates crosswind & head/tail wind readings. Unlike traditional compasses, the WM-300 reads when held vertically and can be used for taking bearings. It also includes our Accuweather.com patented Comfort Index, which is the effect of temp, wind speed, relative humidity & sun intensity on the human body and is superior to Heat Index. WM-300 can be tripod-mounted and accommodates the Model SM-WT wind tunnel accessory for very precise measurements. All WindMates meet NIST calibration standards and wind speed accuracy tested better than +/- 3%. 2-Year Warranty.

Features: ·Current, maximum wind speed ·Average wind speed over 10 seconds ·Wind direction in degrees & compass points ·Calculates cross wind, head/tail wind ·Use as a bearing compass ·Temp/windchill/relative humidity/wet bulb/dew point/Delta T ·Backlight ·Choose any measurement unit ·Reads in tenths ·Replaceable 400-hr Lithium battery ·Easy to read LCD ·Swiss-made impeller components ·Swiss humidity sensor is lifetime calibrated ·USA fluxgate compass ·Threaded for tripod mounting ·Unique pocket-knife design to protect unit when not in use ·Comes with adjustable lanyard ·Water resistant ·Floats ·2 year warranty Specifications: ACCURACY: Wind +/- 3% when aligned with winds axis Temp/Windchill +/- 1.8° F Compass +/- 2° Relative humidity +/- 3% Wet bulb & dewpoint +/- 3.6 RANGE: Wind .8-89 MPH Temp -20° to 158° F Windchill -50° to +50° F Compass 0 to 360 Relative humidity 5% to 95% Wet bulb 32° to 100° F Dew point -20° to 158° F RESPONSE TIMES: Current & maximum wind 1-sec Avg wind over 10-secs Temp 1-minute * Windchill 1-sec Wind direction & compass 1-sec Cross/head/tail wind 5-sec Relative humidity, wet bulb, Delta T, dew point 1-minute OPTIONAL UNITS: Knots, MPH, KPH, Ft/Min, M/Sec, Beaufort ° F or ° C POWER: CR2032 Lithium battery (included) MEASURES: 5.5 x 1.75 x .75 (closed) WEIGHS: 3.4 oz