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【USB connection to computer】 The BT-856A comes with a USB cable and associated software. Once connected to a computer, it displays the measurement data in real time and dynamically generates the wind speed curve. Real-time data can be exported and saved for in-depth analysis. Compatible with Windows 7 / XP / 10 operating systems. In addition, the anemometer can store 600 sets of data, which you can view and delete directly on Anemometer. 【High Precision Outdoor Anemometer】Wind speed measurement range: 0.0-45.0 m/s (accuracy: ±3% + 0.1% rdg, resolution: 0.001); the wind speed has 3 measurement modes (Current/Max/Min) and 5 switchable wind speed units (m/s, km/h, ft/min, Knots, mph); temp range: 0.0-45.0°C (°C/°F available). 【CFM/CMM Air Flow Meter】CFM: 0~999,900 ft3/min ; CMM: 0~999,900 m3/min. Enter the Cross section, the measured value will be displayed directly on the screen without manual calculation. It supports 5 measurement modes: (Current/Max/(2/3)Max/Min/AVG). It is widely suitable for HVAC system installation, troubleshooting. It is also suitable for outdoor activities and is the ideal portable weather monitoring anemometer for navigation, aviation and sports shooting. 【Separate Probe Anemometer】The wind speed sensor is connected to the main Wind Speed Meter by a retractable 200 cm cable, for high or hard-to-reach places. It has a data hold function (HOLD) and backlight for clear reading even in dark environments. Its autonomy reaches 20 hours, with automatic shut-off after 5 minutes of inactivity and a low battery indicator function. 【What you get】1 x BT-856A anemometer, 1 x USB cable, 1 x user manual, 1 x 9V battery and 1 x carrying case. Ready to use when the package is opened. The dedicated transport case protects the professional outdoor anemometer properly, making it easy to store and transport outdoors. BTMETER offers lifetime technical support for a serene and worry-free user experience.