Weather monitor has data logging capacity for tracking delta and difference in weather; time stamps 20,000 data points at user decided intervals Industrial weather meter measures/displays air speed or airflow volume in several Imperial or metric units; jumbo backlit LCD can display 3 readouts Auto power off: After 10 minutes of inactivity when on battery power; after 30 minutes when on AC power; automatically disabled when the meter is running on AC power in data logging mode .Hot wire sensor handles even the slightest (2 -Feet/min) air movement with ±3 Percent accuracy Five available air speed units: ft/min, m/sec, mph, km/hr, knots; included laser thermometer allows for instant temperature reading of surfaces Wind speed detector also includes a digital thermometer that displays temperature CE and RoHS approved; comes with USB cable, AC adaptor, battery, PC logging software and a hard carrying case Class II laser product, <1mW power output