This practical anemometer is portable and useful for measuring Air Velocity (wind speed) and it also can show you the ambient . LCD display with backlight it is easy to read value at night. Features: This portable anemometer is a helpful measuring meter for wind speed and measurement. Wind speed unit is switchable: ms kmhr knots or mph. unit is switchable: Celsius(℃) or Fahrenheit(℉). Maximum minimum and average Air Velocity value measurement function. Data holding and the current wind speed selection. LCD display with backlight ONOFF easy for reading. Low battery indication automatic & manual power off function. Compact and convenient to hold and carry. Specifications: Brand Name: SMART SENSOR Color: Black Material: ABS Air Velocity : 0.3～30ms 0.6～58knots; 1～108kmh; 0.7～67mph Air Velocity Unit: ms Knots kmh mph Resolution: 0.1ms; 0.2knots; 0.3kmh; 0.2mph Accuracy: ±5%rdg±0.1 : 0～50℃ / 32～122℉ Resolution: 0.1℃ / 0.1℉ Accuracy: ±2℃ / ±3.6℉ Operating : 0-50℃ (≤80%RH non-condensing) Storage : -10-60℃ (≤90%RH non-condensing) Power Supply: 3* 1.5V AAA Batteries (Not Included) Item Size: 16.5 * 5 * 2.7cm / 6.50 * 1.97 * 1.06in Item Weight: 81.7g / 2.88oz Package Size: 22 * 14.5 * 3.2cm / 8.66 * 5.71 * 1.26in Package Weight: 121g / 4.27oz Package List: 1 * Digital Anemometer 1 * User Manual