BENETECH GT8913 Handheld Digital LCD Hot Wire Anemometer, Battery Not Included1. Measure current wind speed, temperature 2. Measure wind speed MAX wind flow min wind flow 3. 2 3 wind flow value average value 4. Wind speed flow units and temperature units selection 5. Real time measurement when connecting USB with computer software 6. Backlight and data holding( HOLD) 7. Low battery indication 8. Powered by rechargeable lithium ion batteries 9. Automatic shutdown setting 8. 4 x AAA batteries (Not Included) Specification: Package