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/sec Selectable measurement units: m/sec, mph, km/hr or knots Temperature -20 to 50C Sampling rate of 300ms Sapphire jewel bearing ensures fast and accurate readings 30mm LCD display with function indicators Max Memory of measured values since power on Average Memory of measured values since power on Auto power off after 15 minutes of no activity (Can be user disabled) Low battery indication 2 year warranty Supplied with batteries