| Measurement Response Time |
Units |
Operational Range |
Resolution |
Accuracy (+/-) |
Specification Range |
|
Wind Speed
1 second |
m/s |
0.4 to 60.0 m/s |
0.1 |
Larger of 3% of reading or least significant digit |
0.4 to 40.0 m/s |
| ft/min |
59 to 11,948 ft/min |
1 |
59 to 7877 ft/min |
| km/h |
1.0 to 218.0 km/h |
0.1 |
1.0 to 144.0 km/h |
| mph |
0.8 to 135.0 mph |
1 |
0.8 to 89.0 mph |
| knots |
0.6 to 118.3 kt |
0.1 |
|
0.6 to 78.0 kt |
| |
Beaufort |
0 to 12 B |
0.1 |
|
0 to 12 B |
|
1 inch diameter impeller with precision axle and sapphire bearings. Off-axis accuracy -1% @ 5º off-axis; -2% @ 10º; -3% @ 15º. Calibration drift < 1% after 100 hours use at 16 MPH / 7 m/s. Sustained operation above 60 MPH / 27 m/s will wear impeller rapidly and may cause destruction of impeller. Replacement impeller (NK PN-0801) may be field-installed without tools (US Patent 5,783,753). |
|
Temperature
1 second |
°F |
-49.0 to 257.0 °F |
0.1 |
1.8 °F |
-20.0 to 158.0 °F |
|
°C |
-45.0 to 125.0 °C |
0.1 |
1.0 °C |
-29.0 to 70.0 °C |
|
|
Measures air, water and snow temperature. Thermally isolated, hermetically sealed, precision thermistor mounted externally (US Patent 5,939,645). Calibration drift negligible. |
|
Pressure
1 second
(mb & PSI 4000 model only) |
inHg |
0.3 to 32.5 inHg |
0.01 |
0.05 inHg |
At 77.0 °F, 22.1 to 32.5 inHg |
|
hPa / mb |
10.0 to 1100.0 hPa / mb |
0.1 |
1.5 hPa / mb |
At 25.0 °C, 750 to 1100 hPa / mb |
|
PSI |
0.15 to 16.0 PSI |
0.01 |
0.02 PSI |
At 77.0 °F, 10.9 to 16.0 PSI |
|
|
Monolithic silicon piezoresistive pressure sensor with second-order temperature correction. Maximum error over temperature range 32 to 158 °F (0 to 70°C) , +/- 0.06 inHg / +/-2.0 hPa. Calibration drift typically -0.03 inHg / -1.0 hPa per year. Pressure sensor may be recalibrated at factory or in field. |
|
Altitude
1 second |
ft |
-6000 to 30000 ft |
1 |
50 ft |
At 77.0 °F, <19,700 ft. Max error +/- 98 ft |
|
|
m |
-2000 to 9000 m |
1 |
15 m |
At 25.0 °C, <6,000 m. Max error +/- 30 m |
|
Temperature compensated pressure (barometric) altimeter. |
|
Wind Chill
1 second |
°F |
0.7 to 135.0 MPH, -49.0 to 257.0 °F |
0.1 |
1.8 °F |
1.8 to 89.0 mph, -50.0 to 50.0 °F |
|
°C |
0.4 to 60.0 m/s, -45.0 to 125.0 °C |
0.1 |
1.0 °C |
0.4 to 40 m/s, -45.6 to 10.0 °C |
|
|
Calculated from the primary measurements of wind speed and temperature. Utilizes the NWS Wind Chill Temperature (WCT) Index, revised 2001, with wind speed adjusted by a factor of 1.5 to yield equivalent results to wind speed measured at 10 m above ground. (Specification temperature limits established by WCT Tables.) |
|
Max/Avg Wind Speed |
One-button clear and restart of Max Wind Gust and Average Wind measurement. |
|
Pressure Trend |
Continuously updating three-hour barometric pressure trend indicator: rising rapidly, rising, steady, falling, falling rapidly. |
|
Display |
Reflective 4 digit LCD. Digit height 0.36 in / 9 mm. |
|
Display Update |
1 second. |
|
Display Backlight |
Aviation green electroluminescent backlight. |
|
Clock / Calendar |
Real-time hours:minutes clock. |
|
Operational Temperature Range
(LCD and Batteries) |
The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Beyond the limits of the operational temperature range, the unit must be maintained within range and exposed for minimum time necessary to take reading. |
|
Storage Temperature |
-22 °F to 140 °F / -30 °C to 60 °C. |
|
Auto Shutdown |
After 45 minutes of no key presses. |
|
Certifications |
CE certified. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge). |
|
Batteries |
CR2032, one, included. Average life, 300 hours of use, +/-depending on backlight use. |
|
Environmental |
Waterproof (IP67 standard). Drop-tested (MIL.STD.810F; unit only. Substantial impact may damage replaceable impeller.). |
|
Dimensions |
Unit 4.8 x 1.7 x 0.7 in / 122 x 42 x 18 mm. Case 4.8 x 1.9 x 1.1 in / 122 x 48 x 28 mm. |
|
Weight |
Unit 2.3 oz / 65 g. Case 1.3 oz / 37 g. |