Feature:1. Air Velocity/Air Temperature/Air Flow: Multiple functions, it can be switched between different measurement units.2. 8 Fan Blades: 8 fan blades design, with low friction and high precision bearings, high-sensitive response.3. Prompt When Over Upper/Lower Limit: The upper and lower alarm limit can be set separately. When over upper/lower limit, there will be a buzzer alarm sound, and the alarm indicator light will flash.4. Data Storage: It can record and store 1000 groups data; TA642B/C can connect the PC through the USB to export the data records and generate charts.5. USB Connection (only TA642B/C): With data records download and real-time PC connection function, it can display real-time data sheet and real-time data charts.6. Dual Power Mode/Auto Power Off: Dual power modes: 3 x 1.5V AA (LR06) battery (not included) or USB power supply; Automatic power off after 15 minutes without operation (can be disabled).Specification:Features:Air Velocity/Air Temperature/Air Flow: Multiple functions, it can be switched between different measurement units.8 Fan Blades: 8 fan blades design, with low friction and high precision bearings, high-sensitive response.Prompt When Over Upper/Lower Limit: The upper and lower alarm limit can be set separately. When over upper/lower limit, there will be a buzzer alarm sound, and the alarm indicator light will flash.Data Storage: It can record and store 1000 groups data; TA642B/C can connect the PC through the USB to export the data records and generate charts.USB Connection (only TA642B/C): With data records download and real-time PC connection function, it can display real-time data sheet and real-time data charts.Dual Power Mode/Auto Power Off: Dual power modes: 3 x 1.5V AA (LR06) battery (not included) or USB power supply; Automatic power off after 15 minutes without operation (can be disabled).Specifications:Model: TA642A, TA642B, TA642C (Optional)Material: ABSMeasurement Method: Intergral type (TA642A, TA642B); Split type (TA642C)Air Velocity:Range: 0.06-45.0m/sAccuracy: ±(2%+0.2)Resolution: 0.01/0.1/1Air Temperature: Range: 0~45 (32~113)Accuracy: ±2 (±3.6)Resolution: 0.1/1Display: 4 digits, max 9999Sensor: Infrared laser tube cutting methodSampling Rate: 2 times/sRepeated Test Deviation: ±2%Data Storage: 1000 groupsUSB Connection: No (TA642A), Yes (TA642B, TA642C)Auto Power Off: 15 mins (can be disabled)Working Enviroment: -10~50. Max 80%RH, indoor altitude2000mStorage Enviroment: -10~50. Max 70%RH (battery removed)Screen Size: 53 * 44mmPower Supply: 3 * 1.5V AA (LR06) battery (Not included), USB micro interface 5VItem Size: 175 * 70 * 35mm / 6.89 * 2.75 * 1.38inItem Weight: 210g / 7.41ozPackage Weight: 600g / 21.16ozPackage Size: 36 * 16 * 5.6cm / 14.17 * 6.29 * 2.20inPackage List:1 * Digital Anemometer1 * USB Cable1 * Cloth Bag1 * User Manual (English)Package List:1 * Digital Anemometer1 * USB Cable1 * Cloth Bag1 * User Manual (English)