Digital Anemometer with LCD Backlight: Wind Speed Gauge Meter for Air Volume Measurement - Professional Electrician Tool Specifications: Range of Air Volume: 0-9999 CFM (CMM, CMS) Air Temperature: -20~60°C(-14~140°F) Dew Point Temperature of Air: -20~60°C (-4~140°F) Wet Bulb Temperature: -50~60°C (-58~140°F) Air Humidity: 0~99% Backlight: Yes Air Duct Area Setting: Yes Data Hold: Yes Max/Min/Avg Hold: Yes Auto Power Off: Yes Low Battery Indication: Yes Power: 3x1.5V AAA Batteries (Not Included) Safety Rating: EN61326-1 HT625A - Air Speed Range Range: 0.40~30.00m/s 1.40~108.0km/h 1.30 ~ 98.50ft/s 0.80~ 58.30Knots 0.90~ 67.10mile/h 78 .00~ 5900ft/m Resolution: 0.01~1 USB: No Display: 9999 counters with bargraph HT625B - Air Speed Range Range: 0.40~30.00m/s 1.40~108.0km/h 1.30 ~ 98.50ft/s 0.80~ 58.30Knots 0.90~ 67.10mile/h 78 .00~ 5900ft/m Resolution: 0.01~1 USB: Yes Display: 9999 counters Compatibility: Suitable for various applications including but not limited to: HVAC systems Air ducts Ventilation systems Industrial settings Environmental monitoring Note: Batteries are not included in the package. Digital Anemometers LCD Backlight Wind Speed Gauge Meter Air Volume Speed Scale Measuring Tester Professional Electricican Tools