[High precision] The fan uses 6 blades, which is suitable for various measurement purposes. Range / resolution / precision: temperature (?): -20 ~ 60, 0.1, 1, 4s; humidity: 0 ~ 100% RH, 0.1% RH, 5% RH; wind chill ( C): -40 ~ 10, 0.1, 2; Dew point (degrees Celsius): -40 ~ 60, 0.1, 2; Wind speed: 0.7 ~ 30m / s, 0.1m / s, 3% or 0.3m / s; Atmospheric pressure: 300 ~ 1100hPa, 0.1hPa, 1.0hPa; Altitude: -500 ~ 9000m, 1m; Illumination: 0 ~ 55000Lx, 1LX, 3% [8 in 1 multifunctional design] Our portable anemometer integrates 8 measurement values of air pressure, humidity, lighting, altitude, temperature , wind chill, dew point and wind speed. A machine is versatile, practical and efficient, bringing you more convenience of measurement [Upper material] The versatile hemometer is made of high quality ABS plastic, which has the characteristics of toughness, durability, strength wear and drop resistance.It has good stability, wide range, reliable precision and high sensitivity. And can withstand some impact during use and maintain a longer lifespan [Small and portable] The device is only the size of a palm, and the size is only 122 * 48 * 212mm / 4 , 79 * 1.89 * 8.33 inch. [Ergonomic design] The body adopts non-slip design, which helps better grip and feel, will not fall or slip easily, and can provide more stable control during use