Pro Air Flow CFM Anemometer: Accurately measures wind velocity in 5 units: m/s, km/h, ft/min, knots, mph. wind temp in ℃/℉ , air flow in CFM CMM. Allows you to record 600 groups of wind data, and comes with carrying storage case that provides good protection and keep everything together. Higher Range Wind Speed Meter: 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. And also provides Current, Max, Min, 2/3 Max, Average of wind velocity, wind flow readings Airflow CFM Meter: BT-846A wind speed gauge measures Wind flow range: CFM 0-999900 ft3/min, Resolution: 0.001-100, Air flow area: 0.001-9999 ft2. You can just set the cross sectional area of the register or vent, the air volume will display in CFM/ CMM synchronously during the air flowing measurement. Separated Extendable Wind Sensor: Built with user-friendly extendable wind sensor vane, so you can still look at the readings easily while you testing balancing the AC or dust collection system. 1.69 x 2.36 inch large Backlit LCD display can help you read the wind changes easily. Must Have for Air Balancing: Designed for HVAC trouble-shooting, air flow balancing. The separated wind speed sensor can be replaced if it's broke to increase the service life. Manual or Auto power off after 5 mins without operation to save the battery. Features: ①Back Light ②Low Battery Indicator ③MAX/MIN for wind velocity ④Average/ 2/3MAX for wind flow ⑤Records 600 groups of measurement ⑥Data holding, storing and deleting function ⑦Manual / Auto Power Off after 5 min without operation ⑧Unit optional for wind velocity, temperature and wind flow ⑨Unit switchable for wind velocity, temperature and wind flow Color:As Shown Material:plastic Package C