Replacement Wind Sensor Wand for BTMETER BT-856A BT-846A Pro HVAC Anemometer - (Sensor Vane ONLY, Anemometer NOT Included)   Product Description   ☛IMPORTANT NOTE☚ This separated wind sensor fan does NOT include the anemometer,it must to work with BT-856A/ BT-846A anemometer for measurement ☺Original Air Flow Sensor: Replacement USB wind sensor for your BTMETER BT-846A BT-856A Pro HVAC CFM meter, just plug the sensor into the main body, then it’s ready to use ☺Low Friction Impeller: A low friction impeller can help you pick up the low winds down to 0.001 and give you an accurate reading. ☺Wide Measurement Range: Higher Wind Speed Range: 0.001~100 mph (Accuracy: +/- 3% +/- 0.2 reading), Resolution: 0.001. Air temperature range 32.0-113.0 ℉(0~45℃), Resolution 0.1 ☺Replaceable Wind Pickup Sensor: Extendable separated wind sensor, Allowing to measure wind speed, air flow from higher and further areas that may not be accessible if you use a integrated anemometer   Product Specification:  ☑Wind Velocity Range: 0.001~100 mph ☑Speed units: m/s, km/h, ft/min, knots, mph ☑Resolution: 0.001 ☑Wind Temp Range: 32.0 ℉- 113.0℉ ☑Compatible with HVAC anemometers: BT-856A/ BT-846A