Measure the wind speed and temperature range at the same time with the Caldwell Wind Wizard! Wind speed range is from .7 MPH to 67 MPH with a variance of + or - 5%. Temperature range is from 14° F to 113° F with a variance of + or - 3° F. Also measures in Celsius. Uses one CR2032 Lithium battery (included). Covered by a 1-year warranty. Technical Information:Caldwell Wind Wizard Features: •LCD backlight •Auto power off •Neck lanyard included CE Ceritified: Yes