With 11 functions built into one meter, the EN150 is an extremely versatile measuring instrument that can be used both indoors and outdoors to calculate different environmental properties EN150 Compact Hygro-Thermo-Anemometer with UV Light Sensor Features: Built-in sensors measure Air Velocity, Air Flow, Temperature, Humidity, Wet Bulb, Dew Point, Heat Index, Wind Chill, Barometric Pressure, Altitude, and UV Light Field replaceable low friction vane wheel improves air velocity accuracy Backlit LCD display (auto off after 5 seconds) Data Hold, Auto Power Off Complete with built-in multiparameter sensors, wrist strap, and CR2032 battery Specifications Range Max Resolution Basic Accuracy Light Level Foot Candles 0 to 1860Fc 0.1Fc ±5% UVA Light - 290nm to 390nm μW/cm² 0 to 1999μW/cm² 1μW/cm² ±4% FS mW/cm² 2 to 20mW/cm² 0.01mW/cm² ±4% FS Air Velocity ft/min (feet per minute) 80 to 3940ft/min 1ft/min ±3% FS m/s (meters per second) 0.4 to 20m/s 0.1m/s ±3% FS km/h (kilometers per hour) 1.4 to 72km/h 0.1km/h ±3% FS MPH (miles per hour) 0.9 to 45MPH 0.1MPH ±3% FS Knots (nautical miles per hour) 0.8 to 38.8 knots 0.1 knots ±3% FS Air Volume CFM 0.847 to 1,271, 300CFM 0.001CFM CMM 0.024 to 36000CMM 0.001CMM Temperature (with optional probe) 14 to 212°F (-10 to 100°C) 0.1°F/°C ±2.5°F/±1.2°C Temperature (ambient) 32 to 122°F (0 to 50°C) 0.1°F/°C ±2.5°F/±1.2°C % Relative Humidity 10 to 95% RH 0.1%RH ±4% RH of reading Wet Bulb 22.3 to 120.2°F (-5.4 to 49.0°C) 0.1°F/°C Calculated Dew Point -13.5 to 120.2°F (-25.3 to 49.0°C) 0.1°F/°C Calculated Wind Chill 15.1 to 111.6°F (-9.4 to 44.2°C) 0.1°F/°C ±3.6°F/±2°C Heat Index 32 to 212°F (0 to 100°C) 0.1°F/°C ±3.6°F/±2°C Barometric Pressure inHg 0.29 to 32.48inHg 0.01inHg ±0.05inHg mmHg 7.5 to 825mmHg 0.1mmHg ±1.2mmHg hPa 10 to 1100hPa 0.1hPa ±2hPa Altitude Feet (ft) -6000 to 30000ft 1ft ±50ft Meters (m) -2000 to 9000m 1m ±15m Dimensions 4.7 x 1.7 x 0.7" (120 x 45 x 20mm); Vane: 1.2" (31mm) Weight 5.6oz (160g) Anemometer EN150 Extech Flow Meter à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÅÁ à¤Ã×èͧÇÑ´»ÃÔÁÒµÃÅÁ