Specifications: Display:Dual LCD Measurement units:M/s,km/h,ft/min,knots,mph Temperature units:¡æ/¨H£¬CFM Data hold:Freezes reading on the display Air velocity sensor: Conventional twisted vane arm with low friction Ball-bearing Memory Recall:Record and Recall Maximum/Minimum(MAX/MIN)readings Auto Power off: After 15 minutes Operating Temperature :0¡æto 50 ¡æ (30-122 ¨H) Operating Humidity: The biggest 80% RF The power supply: 9 v battery Products include: 1 * anemometer 1 * instruction