The AMT-905V is an easy-to-use cup thermo-anemometer that has been specifically made for use outdoors. It has a design that will detect airflow from any direction which has a distinct advantage over conventional flat vane anemometers. It has user selectable measuring units for air velocity and temperature. The instrument has a memory for maximum measured values and average since power on. It has a dual display of airflow and environmental temperature on a Hi-Contrast LCD display.0.7 to 30m/sec x 0.1m/secSelectable measurement units: m/sec, mph, km/hr or knotsTemperature -20 to 50CSampling rate of 300msSapphire jewel bearing ensures fast and accurate readings30mm LCD display with function indicatorsMax Memory of measured values since power onAverage Memory of measured values since power onAuto power off after 15 minutes of no activity (Can be user disabled)Low battery indication2 year warrantySupplied with batteries