Kestrel 4500 Weather Meter

Features: Barometric Pressure & Trend Altitude & Density Altitude Relative Humidity & Dew Point Wind Chill & Heat Stress Index Wet Bulb Temperature Air, Water, & Snow Temperature Current & Average Wind Speed Maximum Wind Gust One-button clear and restart of Max Wind Gust and Average Wind measurement Digital compass provides direction and stores data with wind speed Automatic Crosswind calculator Headwind/ Tailwind speeds Waterproof & Floats Manual data capture Automatic Data Storage Customizable Data Storage - chart up to 2, 000 measurements Auto data storage interval settable from 2 seconds to 12 hours Minimum, maximum, average and logged history stored and displayed for every measured value Automatically store measurements, even when the unit is turned off Manually store measurements with the press of a button Data Upload with optional PC interface and provided software Optional RS-232 connection with USB adapter available Aviation green electroluminescent backlight ( Kestrel 4500) Night-vision preserving electroluminescent backlight ( Kestrel 4500 NV) . Backlight incorporates optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve night vision. Please note: This backlight appears soft greyish pink, not " red, " and is still in the visible spectrum, so is not compatible with night-vision equipment. Choice of automatic or manual backlight activation Real-time hours: minutes: seconds clock, calendar, automatic leap-year adjustment User-selectable auto shutdown: 15 or 60 minutes with no keypresses or disabled Five Languages: English, French, Spanish, German, and Italian User-replaceable Impeller Flip-top Impeller Cover Soft Carry Case Wrist and Neck Lanyards Five-year warranty from the manufacturer SPECIFICATIONS Wind Speed ( sample every 1 second) 0.4 to 40 m/ s ( 0.1 resolution, 3% accuracy) 59 to 7, 877 ft/ min ( 1 resolution, 3% accuracy) 1.0 to 144 km/ h ( 0.1 resolution, 3% accuracy) 0.8 to 89 mph ( 1 resolution, 3% accuracy) 0.6 to 78 kt ( 0.1 resolution, 3% accuracy) 0 to 12 Beaufort ( 0.1 resolution, 3% accuracy) Temperature ( sample every 1 second) -20.0 to 158.0 ° F ( 0.1 res, 1.8 ° F accuracy) -29.0 to 70.0 ° C ( 0.1 res, 1.0 ° C accuracy) Relative Humidity ( sample every 1 minute) 0.0 to 100.0 % ( 0.1 res, 3.0 % RH accuracy) Barometric Pressure ( sample every 1 second) 8.86 to 32.48 inHg ( 0.01 resolution, 0.05 inHg accuracy) 300 to 1100 hPa / mb ( 0.1 resolution, 1.5 hPa / mb accuracy) PSI ( 0.1 resolution) Altitude ( sample every 1 second) -6000 to 30000 ft ( 1 res, 50 ft accuracy) -2000 to 9000 m ( 1 res, 15 m accuracy) Wind Chill ( sample every 1 second) -49.0 to 257.0 ° F ( 0.1 res, 1.8 ° F accuracy) -45.0 to 125.0 ° C ( 0.1 res, 1.0 ° C accuracy) Heat Index ( sample every 1 minute) 0.0 to 100.0 % RH, -49.0 to 257.0 ° F ( 0.1 resolution, 3.6 ° F accuracy) -0.0 to 100.0 % RH, -45.0 to 125.0 ° C ( 0.1 resolution, 2.0 ° C accuracy) Dew Point ( sample every 1 minute) 0.0 to 100.0 % RH, -49.0 to 257.0 ° F ( 0.1 resolution, 3.6 ° F accuracy) 0.0 to 100.0 % RH, -45.0 to 125.0 ° C ( 0.1 resolution, 2.0 ° C accuracy) Wet Bulb ( sample every 1 minute) -49.0 to 257.0 ° F, 0.0 to 100.0 % RH, 8.86 to 32.48 inHg ( 0.1 resolution, 3.6 ° F accuracy) -45.0 to 125.0 ° C, 0.0 to 100.0 % RH, 300.0 to 1100.0 hPa ( 0.1 resolution, 2.0 ° C accuracy) Density Altitude ( sample every 1 second) FT: -49.0 to 257.0 ° F, 0.0 to 100.0 % RH, 8.86 to 32.48 inHg ( 1 res, 246 accuracy) M: -45.0 to 125.0 ° C, 0.0 to 100.0 % RH, 300.0 to 1100.0 hPa ( 1 res, 75 accuracy) Power requirements: 2 AAA Alkaline batteries ( included) Battery life: ± 400 hours, depending on backlight use Dimensions: 5.0" x 1.8" x 1.1" ( 12.7cm x 4.5cm x 2.8cm)