Versatile anemometer uses a low-friction vane and displays air velocity measurements in five units. High-precision humidity sensor provides a quick response time to make accurate calculations for wet bulb, dew point, heat index and windchill readings. Dual-line display simultaneously shows relative humidity and temperature, or air velocity and temperature. Optional external high-accuracy temperature probe expands the measurement range to 14 to 212°F (-10 to 100°C).