or Air Velocity
||Larger of 3% of reading, least significant digit or 20 ft/min
||0.6 to 60.0 m/s
0.6 to 40.0 m/s
|1 inch diameter impeller with precision axle and low-friction Zytel® bearings.
Start-up speed stated as lower limit, readings may be taken down to 0.4 m/s | 79 ft/min | 1.5 km/h | .9 mph | .8 kt after impeller start-up.
Off-axis accuracy -1% @ 5° off-axis; -2% @ 10° -3% @ 15°.
Calibration drift < 1% after 100 hours use at 16 MPH | 7 m/s.
Replacement impeller (NK PN-0801) field installs without tools (US Patent 5,783,753).
||18 to 11,811 ft/min
118 to 7,874 ft/min
||2.2 to 216.0 km/h
2.2 to 144.0 km/h
||1.3 to 134.2 mph
1.3 to 89.5 mph
||1.2 to 116.6 knots
1.2 to 77.8 knots
||0 to 12 B
||One-button clear and restart of Max Wind Gust and Average Wind measurement by powering down and restarting unit.
|Display & Backlight
||Reflective 3 1/2 digit LCD. Digit height 0.36 in / 9 mm. Aviation green electroluminescent backlight (except in Kestrel 1000). Manual activation with auto-off.
|Response Time & Display Update
||All measurements except those based on relative humidity respond accurately within 1 second. Relative humidity and all measurements which include RH in their calculation may require as long as 1 minute to fully equilibrate to a large change in the measurement environment. Display updates every 1 second.
|Operational & Storage Temperature Range
||The operational temperature range of the liquid crystal display and batteries is 14° F to 131° F / -10 °C to 55 °C. Measurements beyond the operational range can be taken by briefly exposing unit to extreme conditions such that the display and batteries remain within the operational range. Storage range -22 °F to 140 °F / -30 °C to 60 °C.
||After 45 minutes of no key presses.
||CE certified, RoHS and WEEE compliant. Individually tested to NIST-traceable standards (written certificate of tests available at additional charge).
||CR2032, one, included. Average life, 300 hours. Battery life reduced by backlight use in 2000 to 3500 models.
||Waterproof (IP67 and NEMA-6). MIL-STD-810F, Transit Shock, Method 516.5 Procedure IV; unit only; impact may damage replaceable impeller.
|Size & Weight
||4.8 x 1.9 x 1.1 in / 12.2 x 4.8 x 2.8 cm, 3.6 oz / 102 g (including slip-on cover).