à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÅÁ à¤Ã×èͧÇÑ´ÅÁ CFM CMM Meter Flow Meter à¤Ã×èͧÇÑ´»ÃÔÁÒµÃÅÁ »ÃÔÁÒ³ÅÁ CFM/CMM > à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÅÁ à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÅÁ áÅÐÍسËÀÙÁÔ à¤Ã×èͧÇÑ´¤ÇÒÁª×é¹ 45158 Mini Thermo-Anemometer+Humidity 45158 Waterproof pocket size with Air Velocity, Temperature, %RH, Dew Point and Windchill Display air velocity and either Relative Humidity, Dew Point, Temperature or Windchill Selectable averaging function of 5, 10, or 13 second intervals Fold up protective housing extends to 9" (229mm) for better reach, Tripod mount Data Hold with Auto power off Water resistant housing floats Specifications (Range / Resolution / Basic Accuracy): ft/min (feet per minute): 100 to 5500 ft/min / 20ft/min / +/- (3%rdg + 40ft/min) m/s (meters per second): 0.5 to 28m/s / 0.1ms / +/- (3%rdg + 0.2m/s) km/h (kilometers per hour): 1.8 to 100.6km/h / 0.7km/h / +/- (3%rdg 1.4km/h) MPH (Miles per hour): 1.1 to 62.5 MPH / 0.2 MPH / +/- (3%rdg + 0.4 MPH) knots (nautical miles per hour): 1.0 to 54.3 knots / 0.3knots / +/- (3%rdg + 0.6 knots) Beaufort Force: 1 to 17 BF / 1 BF / +/- 1 Temperature: 0 to 122 deg. F (-18 to 50 deg. C) / 0.1deg. F/deg. C / +/- 1.8 deg. F/+/-1deg. C Relative Humidity: (Model 45158) : 10% to 95% / 1% / +/- 4% Dew Point: (Model 45158): 32 deg. F to 122 deg. F / 1deg. / +/- 2% Power: CR2032 Lithium battery Dimensions: 5.25 x 2.75 x 0.75" (133 x 70 x 19 mm) Vane: 1" (24 mm) diameter Weight: 3 oz. (95g) 45158 Anemometer Extech Humidity Temperature à¤Ã×èͧÇÑ´¤ÇÒÁàÃçÇÅÁ à¤Ã×èͧÇÑ´»ÃÔÁÒµÃÅÁ à¤Ã×èͧÇÑ´ÍѵÃÒ¤ÇÒÁàÃçÇÅÁ à¤Ã×èͧÇÑ´ÍسËÀÙÁÔ ¤ÇÒÁª×é¹ áºº¾¡¾Ò